Question

represent one-fifth of a number is 5 less than that number

Answer 1

Let the no. be x
A/Q
1/5x=x-5
x/5=x-5
x=x-5×5
x=x-25
x-x=-25
-x=-25
x=25

Answer 2

Let the number be x

1/5th of a number = x/5

one-fifth of a number is 5 less than that number,

x/5 = x-5

x = 5(x-5)

x = 5x-25

5x-x = 25

4x = 25

x = 25/4

Therefore, the number is 25/4

Hope it helps