Question

3/4 of a number is 15 work out 4/5

Answer 1

Let the number be X
3/4 of X = 15

Multiplying out gives;
3X = 4x15
3X= 60
X = 20

Therefore, 4/5 of 20

Putting X = 20 we have;

4/5 x 20 = 16