Question

a number exceeds 20 of itself by 40 find the number

Answer 1

$x - 20 \times x = 40 \\ x - 20x = 40 \\ - 19x = 40 \\ x = - 40 \div 9$

Answer 2

Let the required number be x. 20% of x= x/5% x-x/5%=40 4x/5=40 X=40×5/4=50