Question

Three-quarters of a number is 15
work out four-fifths of the number

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

Hope this help!