There are three sections A,B and C in a class .Every section has some boy and some girl students in it .Probability of a girl being selected when one student is selected randomly from section A is `(2)/(5)` , that from section B is `(4)/(9)` and that from section C is `(5)/(9)`.
If 20 girls leaves section B, then the probability of a boy being selected when one students is selected randomly from this section will be `(5)/(8)` .What is the number of boys in section B?

Options

A. A)120
B. B)100
C. C)75
D. D)60

Answer

B