Question 414100
  <pre><font face = "Times" size = 3 color = "indigo"><b>
Hi
two positive numbers whose sum equals 20 
Let x and (20-x) represent the numbers
Question states***
   (20-x)^2 - x^2 = 40
Solving for x
  400 - 40x + x^2 - x^2 = 40
      360 = 40x
       9 = x   The two positive numbers are 9 and 11  (20-9)

CHECKING our Answer***
   121 - 81 = 40