Question

Four fifth of a certain number is 64, Half of that number is *

Answer 1

Solution-

Let the number be x

Therefore, 4x/5 = 64

                     4x = 320

                        x = 80

Hence, 1/2 of the number = 1/2 * 80 = 40

Answer 2

ATQ

4/5x = 64

x = 64 x 5/4

x = 16 x 5

x = 80

Half of 80 = 40