Question

12 Is 90 of what number

Answer 1

Let x be the number we have to find.
90% of x is 12, hence (90/100)*x=12
x=12*100/90=120/9=13.33

Answer 2

90% of x is 12, hence (90/100)*x=12. => x=12*100/90=1200/90=13.33