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Drop-In Centre for 1-1 tutoring:
Room 325 Third Level Robinson Library.
Open during Semesters

11am-3pm Monday to Friday,
11am-4pm Wednesday.

Workbook

Numerical Reasoning tests

V1. August 2004 www.mathcentre.ac.uk Careers Service

Numeric Reasoning and Aptitude Tests
Introduction
These notes are intended to help you with some typical tests that you may encounter in the numeric reasoning part of aptitude tests.
Apart from these notes you can get further advice and guidance from the MATHSAID Centre in the Robinson Library. Details of this now follow.

Maths-Aid Help with Numeracy Skills
If you are worried about any aspect of your basic numeracy skills then the following booklets and leaflets have been designed to help you and they can be read in conjunction with these notes.


Numeracy Refresher Booklet (written to help in your numeric reasoning tests)



Leaflets on decimals, fractions, percentages and ratios.

as well as other booklets supplied by MATHS-AID.
Copies of this material can be found in the


The MATHS-AID Centre in the Robinson Library.

There is a small charge for the Numeracy Refresher Booklet.
Most of the material can also be found at the mathcentre site at www.mathcentre.ac.uk. Free Drop-In Centre
As well as text based help you can get one-to-one help from tutors in the MATHSAID Drop-In Centre in room 325 on the third level of the Robinson Library.
This free service is available to all who want help with basic numeracy and maths as well as those wanting help with aptitude tests.
Times of opening:

Monday, Tuesday, Thursday and Friday, 11.00am to 3pm.
Wednesday, 11am to 4pm

2

Contents
Contents .........................................................................................................................3
1. Numeric Reasoning Questions...................................................................................4
1.1. Tables of Data .....................................................................................................4
1.2 Maths Problems ..................................................................................................4
2. Questions on Data Tables .........................................................................................5
2.1 Solutions ............................................................................................................14
2.2 Further Questions on Data Tables......................................................................23
2.3 Solutions ............................................................................................................24
3. Typical Maths Questions with Solutions .................................................................29
3.1 Maths Questions to Try......................................................................................33
3.2 Solutions - Maths Questions to Try ..................................................................34
4. Question on Graphs..................................................................................................37
4.1 Solutions ............................................................................................................38

3

1. Numeric Reasoning Questions
These notes cover two common types of question.
• Answering questions about tables of data.
• Solving maths problems.

1.1. Tables of Data
The first section is to do with reading information from tables of data and answering questions about the data. This section is split into three parts.
1. A series of example questions which you answer. There will be partial help plus guidance to answering the question using Hint Boxes. Typically you will fill in the required information in the Hint Boxes and then this should give you the answer.
2. Full answers to the questions so that you can compare your results.
3. Another new set of questions, without help, for you to do. Solutions are available. Required Numeracy Skills
You will need the following skills in order to tackle these questions:
• Carefully reading of tables of data and understanding what is being asked of you.
• Comparing and making judgements on the basis of numerical values.
• Estimating values quickly to give ball-park figures on which decisions can be made.
• Using percentages and ratios – in particular how to convert ratios to percentages and also how to work out a percentage increase.
The Numeracy Refresher Booklet (NRB) covers all these important skills. For example you may have to brush up on fractions or decimals before you can confidently answer questions about percentages or even estimate ratios. Also you will have know how to write decimals to a given number of decimal places – the NRB covers this as well.

1.2 Maths Problems
You will be asked to solve problems which may involve the use of basic numeracy skills such as calculating and using percentages and/or ratios. So all the basic numeracy skills you needed for analysing data tables will also be used.
These problems are often stated in terms of “real-life” or context specific questions
e.g. case-studies relevant to the employer’s core activities.
It is important to fully understand the question and what it is asking you to do before you start calculating. This type of question is often failed because the student is solving the wrong problem!
In these notes you are given sample questions together with solutions.
Finally you can then attempt a new set of questions – solutions are given.
Note that the Numeracy Refresher Booklet has been designed to help you with these types of questions as well as the data table questions.

4

2. Questions on Data Tables
The following table describes the income of various industries over a five year period.
There are nine questions in this section and each has a Hint Box for you to fill in if you need help. The data table is repeated on each page.
The next section 2.1 contains full solutions to all these problems.

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 1.
Which industry had the largest increase in the euro amount of income from
Year 3 to Year 4?
For example, Financial Services has an increase of 100-92=8 billion euros from year
3 to year 4.

Answer:
Hint Box:
Write the increase (in billions of euros) and find the largest
Financial Services increase= 8 billion euros
Telecommunications
increase=
Engineering
increase=
Agriculture
increase=
Manufacturing
increase=
Transportation
increase=

5

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 2.
Which industry had the smallest increase in the euro amount of income from
Year 1 to Year 5?
For example, Financial Services has an increase of 110-70=40 billion euros from year 1 to year 5.

Answer:
Hint Box
Write the increase (in billions of euros) and find the smallest.
Financial Services increase= 40 billion euros
Telecommunications
increase=
Engineering
increase=
Agriculture
increase=
Manufacturing
increase=
Transportation
increase=

6

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 3.
Which industry experienced the largest percentage increase from Year 4 to
Year 5?
This means that you have to work out the increase from Year 4 to Year 5 as a percentage of the income in Year 4 for each industry and find the biggest percentage increase. For example Telecommunications had an increase of 1 billion dollars from
23 billion euros in year 4 to year 5 and the percentage increase was therefore

1
× 100% = 4.35% to two decimal places.
23
(Calculating to one decimal place would probably have been enough – but it could be possible that there were two industries with the same % increase to one decimal place) Answer:
Hint Box
Find the percentage increase (in billions of euros) and find the largest
Financial Services
% increase=
Telecommunications
% increase= 4.35%
Engineering
% increase=
Agriculture
% increase=
Manufacturing
% increase=
Transportation
% increase=

7

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 4.
Which industry had the least percentage change from Year 1 to Year 4?
This means that you have to work out the increase from Year 1 to Year 4 as a percentage of the income in Year 1 for each industry and find the smallest percentage increase.
For example Manufacturing had an increase of 233-193=40 billion euros from 193 billion euros in year 1 to 233 billion euros year 4 and the percentage increase was therefore 40
× 100% = 20.73% to two decimal places.
193

(Once again taking two decimal places to be on the safe side.)

Answer:
Hint Box
Find the percentage change for each industry and find the least
Financial Services
% increase=
Telecommunications
% increase=
Engineering
% increase=
Agriculture
% increase=
Manufacturing
% increase= 20.73%
Transportation
% increase=

8

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 5.
a)If the trend in the Transportation industry were to continue, write down the most likely income for Year 6.
b) Which of the above industries would you find difficult to predict a reasonably accurate figure for Year 6?

As an example, consider Financial Services.
The differences between successive years are in billions of euro:
Year 2-Year 1
12

Year 3-Year 2
10

Year 4-Year 3
8

Year 5-Year 4
10

These fluctuate between 8 and 12, and have an average value of 10. Since there is no clear trend we can put forward an increase of 10 as a ball-park figure.
So the prediction would be 110+10 =120 for year 6.
But now consider Manufacturing, we find the differences between successive years:
Year 2-Year 1
5

Year 3-Year 2
8

Year 4-Year 3
27

Year 5-Year 4
34

There is no clear pattern – we need more data. So I would find this difficult to predict other than Year 6 would be an increase on Year 5.

a)Prediction for Transportation in Year 6?
b)Make an estimate for Year 6 for each industry– write a question mark if difficult to predict.
Prediction for Year 6 (billions of euros)
Financial Services
120
Telecommunications
Engineering
Agriculture
Manufacturing
?

9

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 6.
Which type of industry shows the steadiest rate of growth in income during this period of five years?

Some industries are growing by about the same amount every year. Find the one that in your opinion has the steadiest growth i.e. the increases from one year to another have the smallest fluctuation. For example Agriculture has the following differences from one year to the next:
Year 2-Year 1
2

Year 3-Year 2
0

Year 4-Year 3
4

Year 5-Year 4
21

There is a major fluctuation in the growth of income between years 4 and 5 and so the growth in Agriculture income over the five years is not particularly steady.
Industry with steadiest rate of growth:

10

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 7.
In how many instances did a type of industry make a gain of 10% or more over the previous year listed?

Looking at Financial Services we have





Year 1 to Year 2 increase of 12 on 70 - more than 10% increase ( 10% of 70 is 7 and 12 is greater than 7)
Year 2 to Year 3 increase of 10 on 82 - more than 10% increase ( 10% of 82 is 8.2 and 10 is greater than 8.2)
Year 3 to Year 4 increase of 8 on 92 - less than 10% increase ( 10% of 92 is
9.2)
Year 4 to Year 5 increase of 10 on 100 – a 10% increase ( 10% of 100 is 10)

So 3 instances of 10% increases or more for Financial Services.
Now do the same for the other industries. Try not to use a calculator as it is easy to work out 10% of any number – just move the decimal point to the left one place.
Fill in the following table.
For each industry, answer Y if growth is 10% or more, N if less than 10%. Then count the number of Y’s and put in last column.
Do this for all industries.
Finally add up the numbers in the last column and put in the last cell in this column.
Yr1-Yr2 Yr2-Yr3 Yr3-Yr4 Yr4-Yr5 10% or more
Financial Services
Y
Y
N
Y
3
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation
Total Number of instances of 10% or more increases

11

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 8.
Find all industries that increased their respective incomes by more than 20% from Year 1 to Year 3.
For example, if we take Manufacturing, then we find the following information
Growth in billions
Manufacturing

13

% Increase

13
× 100% = 6.7%
193

Note that I have worked out the % increase to one decimal place – there is no point in being more accurate.

Answer - Which Industries have more than a 20% increase?:

12. Hint Box: following, the greatest percentage
Among the increase in income occurred for
Work out the percentage increases from Year 1 to Year 3 and choose those
A. Agriculture with increases 3 and20%. 4 industries between Year over Year

Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

% increase=
% increase=
% increase=
% increase=
% increase= 6.7%
% increase=

12

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
70
82
17
20
33
40
26
28
193
198
38
41

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 9.
Find the average income of each industry over the first three years and over the last four years. Your answers should be to two decimal places.
Working out averages for Financial Services
(70 + 82 + 92)
First three years, average =
= 81.33 to two decimal places.
3
(82 + 92 + 100 + 110)
Last four years, average =
= 96.00
4
You fill in the rest.

Hint Box:
Work out averages in billions of euros for Years 1, 2 and 3 and then work out averages for Years 2, 3, 4 and 5.
First Three years
Last Four Years
Average
Average
Financial Services
81.33
100.67
Telecommunications
Engineering
Agriculture
12. Among the following, the greatest percentage
Manufacturing
increase in income occurred for
Transportation
A. Agriculture between Year 3 and Year 4

13

2.1 Solutions
INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
70
82
17
20
33
40
26
28
193
198
38
41

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 1.
Which industry had the largest increase in the euro amount of income from
Year 3 to Year 4?
Taking away the Year 3 figures from the Year 4 figures we find:

Answer: Manufacturing (increase of 27 billion euros).
Hint Box:
Write the increase (in billions of euros) and find the largest
Financial Services increase= 8
Telecommunications
increase= 2
Engineering
increase= 5
Agriculture
increase= 4
Manufacturing
increase= 27 (the largest)
Transportation
increase= 3

14

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
70
82
17
20
33
40
26
28
193
198
38
41

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 2.
Which industry had the smallest increase in the euro amount of income from
Year 1 to Year 5?
Taking away the Year 1 figures from the Year 5 figures we find:

Answer: Telecommunications (increase of 7 billion euros).
Hint Box
Write the increase (in billions of euros) and find the smallest.
Financial Services increase= 40
Telecommunications
increase= 7
Engineering
increase= 21
Agriculture
increase= 27
Manufacturing
increase= 74
Transportation
increase= 13

15

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
70
82
17
20
33
40
26
28
193
198
38
41

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 3.
Which industry experienced the largest percentage increase from Year 4 to
Year 5?

For each industry you take away Year 4 from Year 5 figures to give the increase.
Then you work out the increase as a percentage of the Year 4 figures – all to two decimal places.
Answer: Agriculture – increase of 65.63% (see box below)
Answer Box
Find the percentage increase (in billions of euros) and find the largest
110 − 100
Financial Services
% increase=
× 100% = 10%
100
24 − 23
Telecommunications
% increase=
× 100% = 4.35%
23
54 − 49
Engineering
% increase=
× 100% = 10.20%
49
Agriculture

Manufacturing
Transportation

53 − 32
× 100% = 65.63%
32
267 − 233
% increase=
× 100% = 14.59%
233
51 − 47
% increase=
× 100% = 8.51%
47

% increase=

16

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
70
82
17
20
33
40
26
28
193
198
38
41

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 4.
Which industry had the least percentage change from Year 1 to Year 4?
You have to work out the increase from Year 1 to Year 4 as a percentage of the income in Year 1 for each industry and find the smallest percentage increase.
I have worked out the percentages to two decimal places.

Answer: Manufacturing, increase of 20.73% years 1 to 4 (see below)
Answer Box
The percentage change from Year 1 to Year 4 for each industry is as follows 100 − 70
Financial Services
% increase=
× 100% = 42.86%
70
23 − 17
Telecommunications
% increase=
× 100% = 35.29%
17
49 − 33
Engineering
% increase=
× 100% = 48.48%
33
32 − 26
Agriculture
% increase=
× 100% = 23.08%
26
233 − 193
Manufacturing
% increase=
× 100% = 20.73%
193
47 − 38
Transportation
% increase=
× 100% = 23.68%
38

17

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 5.
a)If the trend in the Transportation industry were to continue, write down the most likely income for Year 6.
b) Which of the above industries would you find difficult to predict a reasonably accurate figure for Year 6?

In order to answer this question I have drawn up a table of the differences between successive years to see if I can spot any trends from which I can make predictions for
Year 6. The last column gives the predicted increase from Year 5 to Year 6 based on these figures. Note that these are tentative figures and there may be more than one possible choice.
Table of Differences in Successive Years
Industry
Yr2-Yr1 Yr3-Yr2 Yr4-Yr3 Yr5-Yr4 Yr6-Yr5 prediction 12
Financial Services
10
8
10
10
3
Telecommunications
1
2
1
2 or 1
7
Engineering
4
5
5
5
2
Agriculture
0
4
21
?
5
Manufacturing
8
27
34
?
3
Transportation
3
3
4
4 or 3
Based on this table I would add the last column to the income for Year 5 to get the prediction for Year 6.
Answer:
a)Prediction for Transportation in Year 6? 55 or 54

Answer:
b)Make an estimate for Year 6 for each industry– write a question mark if difficult to predict.
Prediction for Year 6 (billions of euros)
Financial Services
110
Telecommunications
26 or 25
Engineering
59
Agriculture
?
Manufacturing
?
So we see that making predictions on Agriculture and Manufacturing is not possible without more data e.g. data on the economic cycle etc..

18

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 6.
Which type of industry shows the steadiest rate of growth in income during this period of five years?

In order to answer this question I use the table of the differences between successive years from the last question to see if there are any industries with steady increases in income over the five years. Apart from Agriculture and Manufacturing (which are industries subject to large fluctuations) the others are fairly consistent in their increases. However, Transportation does seem to have the steadiest rate of growth.
Table of Differences in Successive Years
Industry
Yr2-Yr1 Yr3-Yr2 Yr4-Yr3 Yr5-Yr4 Yr6-Yr5 prediction 12
Financial Services
10
8
10
10
3
Telecommunications
1
2
1
2 or 1
7
Engineering
4
5
5
5
2
Agriculture
0
4
21
?
5
Manufacturing
8
27
34
?
3
Transportation
3
3
4
4 or 3

Answer:
Industry with steadiest rate of growth: Transportation

19

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
82
20
40
28
198
41

70
17
33
26
193
38

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 7.
In how many instances did a type of industry make a gain of 10% or more over the previous year listed?

I have filled in the following table.
For each industry, I have answered Y if growth is 10% or more, N if less than 10%.
Then I have counted the number of Y’s and put this number in the last column. This is done for all industries.
Finally I have added up the numbers in the last column and put the total in the last cell in this column.
Yr1-Yr2 Yr2-Yr3 Yr3-Yr4 Yr4-Yr5 10% or more
Financial Services
Y
Y
N
Y
3
Telecommunications
Y
N
N
N
1
Engineering
Y
Y
Y
Y
4
Agriculture
N
N
Y
Y
2
Manufacturing
N
N
Y
Y
2
Transportation
N
N
N
N
0
Total Number of instances of 10% or more increases
12

So we have found that there are 12 instances of an increase of 10% from one year to the next across all industries.

20

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
70
82
17
20
33
40
26
28
193
198
38
41

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 8.
Find all industries that increased their respective incomes by more than 20% from Year 1 to Year 3.
We form a table of percentage increases for each of the industries for Years 1 to 3.
Note all calculations are to one decimal place as there is no need to be any more accurate. Answer - Which Industries?:
From box below we have
Financial Services
Telecommunications
Engineering

All have increased by more than 20% from Year 1 to Year 3
Answer Box:

12. Among the following, the greatest percentage
These are the percentage increases from Year 1 to Year 3. All to one increase in income occurred for decimal place. I then chose those industries with increases over 20%.
A. Agriculture between Year 3 and Year 4

Financial Services

% increase=

Telecommunications

% increase=

Engineering

% increase=

Agriculture

% increase=

Manufacturing

% increase=

Transportation

% increase=

92 − 70
× 100% = 31.4%
70
21 − 17
× 100% = 23.5%
17
44 − 33
× 100% = 33.3%
33
28 − 26
× 100% = 7.7%
26
206 − 193
× 100% = 6.7%
193
44 − 38
× 100% = 15.8%
38

21

INCOME OF INDUSTRIES (in billions of euros)
Industry
Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

Year 1 Year 2
70
82
17
20
33
40
26
28
193
198
38
41

Year 3
92
21
44
28
206
44

Year 4
100
23
49
32
233
47

Year 5
110
24
54
53
267
51

Question 9.
Find the average income of each industry over the first three years and over the last four years. Your answers should be to two decimal places.

Answer Box:
Averages in billions of euros for Years 1, 2 and 3.
Averages for Years 2, 3,4 and 5.
All calculations to 2 decimal places.

Financial Services
Telecommunications
Engineering
Agriculture
Manufacturing
Transportation

First Three years
Average
81.33
19.33
39
27.33
199
41

Last Four Years
Average
96.00
22.00
46.75
35.25
226.00
45.75

22

2.2 Further Questions on Data Tables
NEWSPAPER READERSHIP
Readership
Percentage of copies
(millions)
Sold in Year 3, by outlet
Daily Newspapers Year 1 Year 2 Year 3 Subscription Newsagents
Daily Herald
5.2
4.9
4.4
52%
38%
Reynolds News
2.7
2.9
3.1
48%
40%
The Echo
6.2
6.1
5.2
32%
50%
Daily Planet
8.3
10.2
10.3
38%
49%
Daily Spin
9.7
9.9
10.5
25%
72%

Study this table of data and answer the questions below. Solutions can be found in the following pages.
The first three columns tell us how many readers (in millions) each newspaper has in each year. Each of these readers may have different ways of purchasing any one paper and also read the paper on a very regular or semi-regular basis. Another complicating factor is that a reader may read and subscribe to more than one of these papers.
The last two columns give information on selling of copies in Year 3. For example,
52% of the Daily Herald copies were sold by subscription.

Questions
1. What is the average readership for each newspaper over the three years?
2. Has the total readership for the five newspapers fallen from Year 1 to Year 3?
Is the total readership in any year the same as the number of different people buying at least one of the five newspapers in that year?
3. If the Daily Planet sold 75 million copies by Subscription in Year 3, how many copies (to the nearest hundred thousand) were sold at the newsagents in Year 3?
4. If the Echo sold 220 million copies in total in Year 3, how many copies (to the nearest hundred thousand) were not sold at the newsagents nor were sold by
Subscription?.
5. The Daily Herald, Reynolds News and Daily Spin are all part of the same group
MadeUp which only has these three papers.
The sales in Year 3 were in the ratios
Daily Herald:Reynolds News:DailySpin= 2:3:4
The total paper sales in Year 3 for the MadeUp group were 873 million.
How many of each of the Made Up papers were sold in Year 3?
How many copies of the Daily Spin were bought at the newsagents in Year 3?
6. Which newspaper showed the largest percentage change in readership from Year
1 to Year 2?
7. Which newspaper showed the smallest percentage change in readership from Year
2 to Year 3?

23

2.3 Solutions
Question 1
What is the average readership for each newspaper over the three years?
Solution
We simply take the averages of the three years
Yr1 Yr2

Yr3
All calculations to 2 decimal places

Daily
Herald

5.2

4.9

4.4

Reynolds
News

2.7

The Echo

6.2

6.1

5.2

Daily
Planet

8.3 10.2

10.3

Daily Spin

9.7

Average=(5.2+4.9+4.4)/3=4.83

2.9

3.1
Average=(2.7+2.9+3.1)/3=2.9

Average=(6.2+6.1+5.2)/3=5.83

Average=(8.3+10.2+10.3)/3=9.60

9.9

10.5
Average=(9.7+9.9+10.5)/3=10.03

Question 2
Has the total readership for the five newspapers fallen from Year 1 to Year 3?
Is the total readership in any year the same as the number of different people buying at least one of the five newspapers in that year?
Solution
Summing up the columns we have
Year 1 Year 2

Year 3

Daily Herald

5.2

4.9

4.4

Reynolds
News

2.7

2.9

3.1

The Echo

6.2

6.1

5.2

Daily Planet

8.3

10.2

10.3

Daily Spin

9.7

9.9

10.5

Total readership 32.1

34

33.5

24

So the total readership has increased from Year 1 to Year 3 and not fallen (although it has fallen from Year 2 to Year 3).
Is the total readership in any year the same as the number of different people buying at least one of the five newspapers in that year?
No – because you can have people buying more than one paper and so adding the readership figures together gives double counting of these people and so over estimates the number of different people reading one of the five papers.

Question 3
If the Daily Planet sold 75 million copies by Subscription in Year 3, how many copies
(to the nearest hundred thousand) were sold at the newsagents in Year 3?
Solution
Year 3 copies sold by subscription

75 million

The
Daily
Planet

% sold by
Number of copies sold subscription In Year 3 (to three decimal places) in Year 3
38%
100
× 75 = 197.368 million
38

The table above shows how to calculate the total number of copies sold in Year 3 given that 38% of the total is 75 million i.e. 197.368 milliion.
We still have to calculate the total sold at the newsagents in Year 3.
49
This is 49% of the total i.e. 49% of 197.368 million =
× 197.368 = 96.71 million.
100
Hence to the nearest hundred thousand the total sold at the newsagents is 96.7 million.

Question 4
If the Echo sold 220 million copies in total in Year 3, how many copies (to the nearest hundred thousand) were not sold at the newsagents nor were sold by
Subscription?.
Solution
This is the information the table gives us for Year 3
% sold by % sold at
Subscription newsagents
The
Echo

32%

50%

The percentage not sold by subscription nor at the newsagents is
100%-32%-50%= 100%-82%=18%
18
And 18% of 220 million is given by
× 220 = 39.6 million. (This is to the nearest
100
hundred thousand already).

25

Question 5
The Daily Herald, Reynolds News and Daily Spin are all part of the same group
MadeUp which only has these three papers.
The sales in Year 3 were in the ratios
Daily Herald:Reynolds News:DailySpin= 2:3:4
The total paper sales in Year 3 for the MadeUp group were 873 million.
How many of each of the Made Up papers were sold in Year 3?
How many copies of the Daily Spin were bought at the newsagents in Year 3?
Solution
We use the ideas of shares. Since the ratios of the sales is 2:3:4 we can allocate
2+3+4 =9 shares and each share gets 873/9=97 million.
The Daily Herald has 2 shares = 2 × 97 = 194 million copies bought in Year 3
The Reynolds News has 3 shares = 3 × 97 = 291 million copies bought in Year 3
The Daily Spin has 4 shares = 4 × 97 = 388 million copies bought in Year 3

Now according to the table 72% of the copies of the Daily Spin were bought at the newsagents in Year 3.
72
This is given by
× 388 = 279.36 million copies in Year 3.
100

26

Question 6
Which newspaper showed the largest percentage change in readership from Year 1 to
Year 2?
Solution
For each paper we find the percentage change from Year 1 to Year 2 by finding the difference of the readership Year 2-Year 1 as a percentage of Year 1 readership. Note that this can be a negative % difference – but we find the largest in magnitude as the answer (i.e. forget about the minus sign and only take account of how big a change we have). We take all our answers to two decimal places.
Yr1

Yr2

%change
Yr1 to Yr 2

Daily
Herald

5.2

4.9

Reynolds
News

2.7

2.9

The
Echo

6.2

6.1

Daily
Planet

8.3 10.2

Daily
Spin

9.7

4 .9 − 5 .2
× 100% = −5.77%
5 .2
2 .9 − 2 .7
× 100% = 7.41%
2. 7
6.1 − 6.2
× 100% = −1.61%
6 .1
10.2 − 8.3
× 100% = 22.89%
8 .3
9.9 − 9.7
× 100% = 2.06%
9.7

9.9

We see that the Daily Planet has had the biggest % change from Years 1 to 2, an increase of 22.89% in the readership.

27

Question 7
Which newspaper showed the smallest percentage change in readership from Year 2 to Year 3?
Solution
For each paper we find the percentage change from Year 2 to Year 3 by finding the difference of the readership Year 3-Year 2 as a percentage of Year 2 readership. Note that this can be a negative % difference – but we find the largest in magnitude as the answer (i.e. forget about the minus sign and only take account of how large a change we have). We take all our answers to two decimal places.
Yr
2

Yr
3

%change
Yr2 to Yr 3

Daily
Herald

4.9

4.4

Reynolds
News

2.9

3.1

The
Echo

6.1

5.2

4 .4 − 4 .9
× 100 = −10.20 %
4 .9
3.1 − 2.9
× 100 = 6.90 %
2 .9
5.2 − 6.1
× 100 = −14.75 %
6 .1
10.3 − 10.2
× 100 = 0.98 %
10.2

Daily
Planet

10.2 10.3

Daily
Spin

9.9 10.5

10.5 − 9.9
× 100 = 6.06 %
9 .9

The Daily Planet has gained 0.98% readers and this is the smallest percentage change from Year 2 to Year 3 amongst all the papers.

28

3. Typical Maths Questions with Solutions
Question 1
The selling price of a box of chocolates is £6.00.
This price was 20% greater than the cost to produce the box.
How much did it cost to produce a box and what was the profit?
Solution
Think of the cost to produce as being 100%. The price is 20% greater, so is 120% of
120
of the cost. the cost i.e.
100
Hence the cost is

100 5
5
= of the price= × £6 = £5 pounds
120 6
6

The profit=selling price-cost = £6-£5=£1.

Question 2
A picture on a page was reduced on a copier to 60% of its original size, and this copy was then reduced by 20%.
What percentage of the size of the original picture was the final copy?
Solution
The picture area has been reduced by 60% or 3/5 (=60/100).
So to find the new size we multiply the original size by 3/5.
If we further reduce the new size by 20% =1/5 then we are have to multiply again by
1 3 3 of the original size we started off with.
1/5 i.e. another we have × =
5 5 25
Now to express this as a percentage we multiply by 100 and we obtain:
3
× 100 = 12% .
25
So the final copy is 12% of the original picture.

Question 3
In a certain department, 15% of the females and 25% of the males are working on a project. 60% of the department is female.
What percentage of the department is working on the project?
Solution
Idea is to add together the % of females in the department working on the project to the % of males in the department working on the project.

29

1. Females
60% of the department is female and 15% of females are working on the project, hence the proportion of females on the project is 15% of 60% of the workers.
15 60
900
9
In terms of fractions this is of the workers i.e. 9%.
×
=
=
100 100 10000 100

Hence 9% of the departmental staff on the project are female.
2. Males
40% of the department is male and 25% are working on the project, hence the proportion of males on the project is 25% of 40% of the workers.
25 40
1000
1
In terms of fractions this is
×
=
= of the workers, which is 10%.
100 100 10000 10

Hence 10% of the departmental staff on the project are male.
So the total percentage is 10%+9%=19% of the department working on the project. Question 4
The total cost for three items of work on a car was £154.
These items were: overhaul of the carburettor, replace brake pads and a tuneup.
Overhaul of the carburettor cost twice as much as the tune-up.
Brake pads cost one-third as much as the carburettor overhaul.
What did the tune-up cost?
There are two solutions given. The first uses idea of shares and the second uses elementary algebra.
Solution 1
We are given that cost carburettor overhaul=cost of 2 tune-ups=cost of 3 brake pads
We can represent the ratios of the costs for the carburettor, tune-up and brake pads by giving cost shares to each of the repairs in the ratios 6:3:2 i.e.
Give the carburettor repair 6 shares, tune-up 3 shares and the brake pads 2 shares.
Then the relative costs are preserved.
Hence there are 6+3+2=11 shares to add up to £154.
So each share is worth £14 and the tune-up gets 3 shares i.e. costs £42.

(I could have given the carburettor 12 shares, tune-up 6 shares and the brake pads 4 shares – all that matters is that the ratios of the shares are the same.
In that case there would be 12+6+4=22 shares each worth £154/22=£7 and the tuneup with 6 shares would still cost 6 × £7 = £42 )

30

Solution 2
We will work out the cost of tune-up as follows
Let C=cost of carburettor work, T=cost of a tune-up, B=cost of brake pads
We are given that C= 2T, and C=3B. So 2T=3B and B=2/3T

So cost repair work = £154 = C+ T+ B
= 2T+T+2/3T=(2+1+2/3)T
= 11/3T
Hence

3
11
T = £154 gives us T =
× £154 = £42 .
11
3

Question 5
A certain preparation consists of liquids x, y, and z in the proportion 5:2:1.
How many gallons of the preparation can be made from a stock of materials consisting of 25 gallons of x, 20 gallons of y, and 8 gallons of z?
Solution
The proportions 5:2:1 have to be preserved.
So if we use G gallons of z then we must use 2G gallons of y and 5G gallons of x. to get 8G gallons of the preparation.

So G has to be as big as possible.
As we have 8 gallons of z, G is not more than 8.
As we have 20 gallons of y, 2G not more than 20 i.e. G not more than 10.
As we have 25 gallons of x, 5G not more than 25 i.e. G not more than 5.
.
So maximum value of G is 5 and we get 8*5=40 gallons of preparation.

31

Question 6
A product costing 60 cents per unit to produce had been selling at the average rate of 1,200,000 units per month.
After the product was improved, sales increased to an average of 2,000,000 units per month.
However, the new product cost five percent more to produce. If the manufacturer's selling price in each instance was 75 cents per unit, what was the manufacturer's added profit per month with the newer product?
Solution
First we work out the cost of production of the new product.
Original production cost =60cents per unit. Profit per unit was 75-60=15cents
Production cost of new product costs 5% more.
Now 5% of 60 =1/20 of 60 =3 cents.
So new production costs = 60+3cents =63cents. Profit per unit is now 75-63=12 cents.
Old profit = 1,200,000*15=18,000,000 cents = $180,000
New profit = 2,000,000*12=24,000,000cents = $240,000
So added profit=$240,000-$180,000=$60,000

32

3.1 Maths Questions to Try
Question 1
Bob has a salary of £35,000.
He has a tax allowance of £5,000 and he pays income tax at 22% on the rest.
He pays into a pension and for this his salary is deducted 8% after tax has been deducted. How much does he get per month assuming that these are the only deductions?

Question 2
An item costs £8.50 to produce. How much should the manufacturer sell these items for if wants to realise a profit of 15% on these items? Give your answer to the nearest penny. Question 3
In a department 10% of the staff have a salary of £20,000, 30% a salary of £25,000,
50% a salary of £30,000, 10% a salary of £40,000.
What is the average salary?

Question 4
Bob, Cilla and Terrence agree to buy ten pounds worth of lottery tickets with Bob contributing £5, Cilla £3 and Terence £2.
They agree that if they win anything with any of these tickets that it should be shared out in the same ratio as their contributions.
They win £250. How much does each get?

Question 5
A product costing 75 p per unit to produce had been selling at the average rate of
650,000 units per month.
After the product was improved, sales increased to an average of 1,000,000 units per month. However, the new product cost 10 percent more to produce. If the manufacturer's selling price in each instance was 105p per unit, what was the manufacturer's added profit per month with the newer product?

Question 6
Same information as in Question 5.
It is projected that if a new marketing campaign for a year is focused on the improved product then sales could be further raised as follows.
£700,000 spent on the campaign then a further 150,000 units per month are projected to be sold in the first year of the campaign. After the campaign has finished it is projected that in the next year sales will be 1,100,000 per month and that in subsequent years sales will also be 1,100,000 per month.
Assuming that all prices and costs stay as they are, how many months are predicted from the beginning of the campaign before the cost of the campaign is recouped?

33

3.2 Solutions - Maths Questions to Try
Question 1
Bob has a salary of £35,000.
He has a tax allowance of £5,000 and he pays income tax at 22% on the rest.
He pays into a pension and for this his salary is deducted 8% after tax has been deducted. How much does he get per month assuming that these are the only deductions?
Solution
Bob is taxed on £35,000-£5,000=£30,000

Income tax is at 22% on this £30,000 and is

22
× 30,000 = £6,600 .
100

Leaving £35,000-£6,600=£28,400.
8
× 28,400 = £2.272
100
The amount left is then £28,400-£2,272=£26,128
26128
Take home per month is
= £2,177.33 .to nearest penny.
12

8% of this is for his pension contributions i.e.

Question 2
An item costs £8.50 to produce. How much should the manufacturer sell these items for if wants to realise a profit of 15% on these items? Give your answer to the nearest penny. Solution
The price of an item is 115% of the production cost in order to realise a profit of 15%.
115
This price is
× 8.5 = £9.775 . Clearly a decision has to be made whether the price
100
is £9.77 or £9.78. Usually numbers such as 9.775 which end with a 5 are rounded up and so we take the price to be £9.78

Question 3
In a department 10% of the staff have a salary of £20,000, 30% a salary of £25,000,
50% a salary of £30,000, 10% a salary of £40,000.
What is the average salary?
Solution This is a weighted average.
The average value is given by

1. For each salary value multiplying the frequency (in fraction form) of the salary amongst the staff by the salary value.
10
2. For example, the salary £20,000 has a frequency of 10% which is
= 0.1
100
and we multiply this by £20,000.
3. Adding these numbers together across all salary values.

34

For this question we have 4 salary values and the weighted average is
10
30
50
10
× 20,000 +
× 25,000 +
× 30,000 +
× 40,000
100
100
100
100
= £2000+£7500+£15000+£4000
=£28,500

Question 4
Bob, Cilla and Terry agree to buy ten pounds worth of lottery tickets with Bob contributing £5, Cilla £3 and Terry £2.
They agree that if they win anything with any of these tickets that it should be shared out in the same ratio as their contributions.
They win £250. How much does each get?
Solution
Their agreement means that the winnings should go to Bob, Cilla, Terry in the ratio
5:3:2. Think of these as being shares in the winnings.
There are 5+3+2 =10 shares in all for the £250.
Hence each share is worth £250/10=£25.
So Bob gets 5 shares = £125, Cilla 3 shares = £75 and Terry 2 shares = £50.

Question 5
A product costing 75 p per unit to produce had been selling at the average rate of
650,000 units per month.
After the product was improved, sales increased to an average of 1,000,000 units per month. However, the new product cost 10 percent more to produce. If the manufacturer's selling price in each instance was 105p per unit, what was the manufacturer's added profit per month with the newer product?
Solution
The improved product costs 10% more to produce.
110
i.e. 110% of original production cost of 75p =
× 75 = 82.5 p.
100
Profit was originally 105-75=30p.
Now with the improved product the profit is 105-82.5= 22.5p
The original profit per month was 650,000 × 30 = 19,500,000 p = £195,000
The new product profit per month is 1,000,000 × 22.5 = 22,500,000 p = £225,000
Hence the added profit per month is £225,000-£195,000=£30,000

35

Question 6
Same information as in Question 5.
It is projected that if a new marketing campaign for a year is focused on the improved product then sales could be further raised as follows.
£700,000 spent on the campaign then a further 150,000 units per month are projected to be sold in the first year of the campaign. After the campaign has finished it is projected that in the next year sales will be 1,100,000 per month and that in subsequent years sales will also be 1,100,000 per month.
Assuming that all prices and costs stay as they are, how many months are predicted from the beginning of the campaign before the cost of the campaign is recouped?
Solution
The profit is 22.5p per item. In the first year there is projected to be an extra profit of
150,000 × 12 × 22.5 p = 40,500,000 p = £405,000
Each year after that the projected extra profit is
100,000 × 12 × 22.5 p = 27,000,000 p = £270,000 with each month contributing
£22,500.

In the first two years it is projected that £405,000+£270,000=£675,000 will be recouped. A further £25,000 is needed and so it will take a further two months at
£22,500 per month to recoup the full amount.
So it is predicted that in 26 months the campaign costs will be recovered and that an extra £22,500 of profit per month thereafter will be realised.

36

4. Question on Graphs

The above graph gives the sales of lager and beer per month in thousands of pints.
The prices of lager and beer does vary from month to month.
However, it is always the case that beer’s price per pint is 20% more than that of lager’s price per pint.
Answer the following questions. Solutions are found in following pages.

Question 1
What was the selling price for lager in July if the income for lager in July was
£28,800? What was the income from beer sales in July?

Question 2
If the selling price of beer was £2.10 per pint in January, what was the selling price of lager? Also what was the total income in that month (both beer and lager)?

Question 3
If the total income for both beer and lager in May was £ 62,700 find the price charged for a pint of lager.

Question 4
Surprisingly, there is always a large amount of lager and beer consumed in October.
Past years has shown that a good predictor for consumption of lager and beer in
October is given by adding 50% on to the consumption of lager in September, and by adding 40% on to the consumption of beer in September.
What price for lager should the Union charge, based on this prediction, so that the predicted total income in October for beer and lager sales is £110,000?

37

4.1 Solutions
Question 1
What was the selling price for lager in July if the income for lager was £28,800?
What was the income from beer sales in July?
Solution
Looking at the graph we see that the 18,000 pints of lager were sold in July.

Hence the price per pint is

28,800 288
=
= £1.60
18,000 180

In order to find the income from beer sales we need to find the price of a pint of beer.
We know that this is 20% more than a pint of lager so:
120
So the price of a pint of beer =
× 1.60 = £1.92
100
Looking at the graph we see that 13,000 pints of beer were sold in July.
So the income from beer sales is 13,000 × 1.92 = £24,960

Question 2
If the selling price of beer was £2.10 per pint in January, what was the selling price of lager?
Also what was the total income in that month (both beer and lager)?
Solution
The price of beer is 20% higher than that of lager, which means that to convert from the price of beer to lager we need to multiply by 100/120=5/6.
100
Hence the price of lager in January is
× 2.10 = £1.75 .
120
Looking at the graph for January we see that
27,000 pints of beer
30,000 pints of lager were sold.

Income from beer sales = 27,000 × 2.10 =£56,700
Income from lager sales = 30,000 × 1.75 = £52,500
Total income =£56,700+£52,500=£109,200

38

Question 3
If the total income for both beer and lager in May was £ 62,700 find the price charged for a pint of lager.
Solution
The graph tells us that
20,000 pints of lager and 15,000 pints of beer were sold in May.

Remember that beer is 20% more expensive than lager.
It follows that 15,000 pints of beer are in price terms the same as
120
× 15000 =18,000 pints of lager.
100
So the total income is obtained by selling the equivalent of
20,000+18,000 =38,000 pints of lager
Since the total income is £62,700, the price of a pint of lager is

62,700
= £1.65
38,000

Question 4
Surprisingly, there is always a large amount of lager and beer consumed in
October. Past years has shown that a good predictor for consumption of lager and beer in October is given by adding 50% on to the consumption of lager in
September, and by adding 40% on to the consumption of beer in September.
What price for lager should the Union charge, based on this prediction, so that the predicted total income in October for beer and lager sales is £110,000?
Solution
The September consumption of lager was 22000 pints. Hence the predicted
150
consumption in October is 150% of 22000=
× 22000 = 33,000 pints of lager.
100

The September consumption of beer was 25000 pints. Hence the predicted
140
consumption in October is 140% of 25000=
× 25000 = 35,000 pints of beer.
100
Remember that the price of a pint of beer is 20% more than that of a pint of lager.
Convert the35,000 pints of beer to the price equivalent number of pints of lager.
120
This is given by
× 35000 = 42,000 pints of lager.
100
Hence the total predicted income for October is price equivalent to
33000+42000=75000 pints of lager.
In order to achieve a predicted income of £110,000 we need to charge
110000
= £1.47 for a pint of lager on taking 2 decimal places
75000

39

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Numerical Reasoning tests

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