chetan2u wrote:

The probability of picking a boy in a class is \(\frac{1}{3}\). If two boys are removed from the class, the probability of picking a boy in the class goes down to \(\frac{5}{16}\). What is the number of boys in the class?

(A) 20

(B) 22

(C) 32

(D) 34

(E) Data insufficient

New question

source - self

let x be boys so total class 3x

now x-2 are boys so total are 3x-2

(x-2)/ (3x-2) = 5/16

16x-32 = 15x -10

16x-15x = 32-10

x=22

IMO B ??

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