Question

2/3 of a number is 20 less than a original number

Answer 1

Let original number is ☓
2/3 of a number is 2/3X

Now according to question

☓ - 2/3X =20
(3X - 2X) 3 =20
3X - 2X =60
☓ =60

Answer 2

Let the original number be x

According to given, 2x/3 = x - 20
                               2x/3 - x = -20
                               2x -3x/3 = -20
                               -x/3 = -20
                               -x = -20 *3
                               -x = -60
                                x = 60

Therefore, the original number is 60

Thank you