There are fewer than 40 students enrolled in a certain class. if, at a certain time, 2/9 of the students are absent from school and 1/4 of those in school have gone to the library, what is the total class enrollment?
a. 18
b. 27
c. 28
d. 32
e. 36

Well, we kinda hope that noone is splitting the students into parts;) so that means that the number of students must be divisible by 4 and 9, and since they don't have any divisors in common, it must be divisible by 4*9=36, and this is also the correct answer - 36.

Iam not sure , but probably 750 or 7.5