Question

the sum and difference of two numbers are 20 and 8 ,then the difference of their square is?

Answer 1

Let, the two numbers are x and y.
So,
x+y=20
x-y=8
therfore the difference of their square is
20×8
=160

Answer 2

The number is 6 and 14
6+14=20
14-6=8
14^2-6^2=196-36=160