There are 600 boys in

Question

There are 600 boys in a hostel. Each plays either hockey or football or both. If 75 % play hockey and 45 % play football, how many play both ?

Options:

A . 48

B . 60

C . 80

D . 120

Answer: Option D

n(A) = `(75/100 xx 600)` = 450., n(B) = `(45/100 xx 600)` = 270, n`(A uu B)` =600

`:.` n`(A nn B)` = n(A) + n(B) - n`(A uu B)` = 450 +270 - 600 = 120.

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