Question 393252
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Hi
their total age is 40
Let x and (40-x)represent John's and Amy's age respectively
Question states***
 (40-x) = x/4
solving for x
 4(40 - x) = x
      160 = 5x
       32 = x, John's age.  Amy is 8.   (40-32)

CHECKING our Answer***
   8 = 32/4