Question 813849
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Hi,
Half the sum of two numbers (x + y) is 20 {{{(x+y)/2 = 20}}}
twice the difference between the two numbers (x-y) is 8. {{{2(x-y) = 8}}}
Question states***
 x + y = 40
 x - y = 4
  2x = 44
   x = 22   and y = 18
CHECKING our Answer***
 40/2 = 20
 2*4 = 8