My pick is B

from 1 we don't know what % of actual students applied for college

from 2)

let x and y be male and female students respectively and total be n

so x + y = n (eqn a)

now from given info and stmt 2, 72% of x and 80% of y applied for class

so .72x + .80y = .75 of total i.e. n so .72x + .8y = .75n (eqn b)


eqn b can be multiplied by 100 and eqn a by 72 to solve them

72x + 80y = 75n
72x + 72y = 72n (-) subtract them

you'll get 8y = 3n
female student % = y = 3/8n * 100 , 100 - y will give male student %

hence B alone is sufficient.

Agreed B alone is sufficient

OA is B

Use method of alligation .......

males ------------- females

72 ------------------ -- 80


----- 75 --------------------------

5 ---------------------- 3


so the composition of the senior class is 5 males and 3 females .........