Question 422332
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Hi
John is twenty years younger than Amy
Let x and (x-20)represent Amy's and John's age NOW
Question states*** in 5 yrs...
 (x-20) + 5 = (1/2)(x+5)
Solving for x
  1/2x = 5/2 + 15
     x = 5 + 30
     x = 35, Amy's age now.  John is now 15.    (35-15)

CHECKING our Answer***in 5 yrs...
   20 = (1/2)40