Question

54 is 75% of what number?

Answer 1

rule of three

x ---- 100%
54 --- 75%

75x = 100 . 54
75x = 5400
x = 5400/75
x = 72 

answer : 72 ... 

Good studies!!

Answer 2

//Work backwards from what your original equation would be.

54 = 75/100 * x
54 * 100 = 75 * x
(54 * 100) / 75 = x
x = 72