Question 396894
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Hi, 
Jack is 4 years older than Jill
Let x and (x + 4) represent Jill's and Jack's ages NOW  respectively
Question states*** in 7 years...
  (x + 7) + (x + 4 + 7) = 72
Solving for x
       2x = 54
       x =  27, Jill's age NOW.    

CHECKING our Answer*** Jack's age NOW is 31.  (27+4)
   34 +  38 = 72