Question

32/? = 20/25
what is ?

Answer 1

When faced with these kinda problems try the rule of 3
32 -> 20
? -> 25

your number would be 25*32/20

Answer 2

a/b = c/d
a = cb/d
da = cb
da/c = b

Answer 3

32/x = 20/25
This is a proportion. To solve it, you cross multiply and solve for x.
(20)(x) = (32)(25)
multiply through and solve for x.
You can then check your answer by subbing in what you got for x back into the proportion, cross multiply, and if both sides come out equal, your answer is correct.