Question

36% of what number = 18

Answer 1

Part over whole times 100 = %
18 is a part of a number. I'll call that number x.
18/x times 100 = 36%

Answer 2

(18/x)(100) = 36
x=50
So 18 is 36% of 50. It's like if you have a test out of 50 and you got 18 right. You would get a mark of 36% on the test. So study hard!