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In a class of 40 students, 24 play football, 18 play volley ...
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In a class of 40 students, 24 play football, 18 play volley ball and 6 do not play any game. How many students play both football and volley ball

A. 2

B. 7

C. 8

D. 9

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University of Lagos Nigeria
11 May 2020

School not set Nigeria
19 November 2020
0

Using set approach

U = total number of students = 40

F = students that plays football = 24

V = students that plays volleyball = 18

x = students that plays both football and volleyball

N = students that do not play any = 6

Total number of students (U) = number of students that plays only football (F') + number of students that plays only volleyball (V') + number of students that plays both (x) + number of students that do not play any (N)

U = F' + V' + x + N

F' = students that plays football(F) - students that plays both (x)

F' = F - x

= 24 - x

V' = students that plays Volleyball (V) - students that plays both (x)

V' = V - x

= 18 - x

Therefore

40 = (24 - x) + x + (18 - x) + 6

40 = 24 - x + x + 18 - x + 6

40 = 24 + 18 - x + 6

40 = 48 - x

x = 8

Ans C

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