Question

the sum of 2 numbers is 25 and their difference is 3 find numbers

Answer 1

The answer is 14 and 11.
14+11=25.
14-11=3.

Answer 2

Let the 2 numbers be x and y
            x+y=25
            x-y= 3
           ______
            2x=28
             x=14
 Substitute x=14 in x+y=25
          14+y=25
           y=25-14
             y=11
  therefore,the 2 numbers are 14 and 11