Question

if there're 400 kids enrolled how many of them are females

Answer 1

Perhaps you should ask them? Somewhere between 0 and 400, inclusive, I would think.

Perhaps a better problem statement would help?
I'm certain showing YOUR work would help.

Answer 2

what % of them are male/female?

Answer 3

something is missing here perhaps a graph or another number

Answer 4

...and don't you dare answer any of those questions without SHOWING YOU WORK!

Answer 5

its just the ? there are 52% female and 48% male

Answer 6

do i do a proportion?

Answer 7

Yes. Let's see it.