Question

four fifths of a number is 20 less than the original number .find the number

Answer 1

let the number be x .
4/5×x=x-20
4x/5=x-20
4x/5-x/1=-20
4x-5x/5=-20
-x/5= -20
-x =-20×5
then x=100

Answer 2

hi friend by calculating the sum I get the answer

X = 100