Question 397584
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Hi, 
Joe is 5 years older than Sally
Let x and (x + 5) represent Sally's and Joe's ages NOW  respectively
Question states*** in 15 years...
   (x + 5)  + 15 = 3x
Solving for x
       20 = 2x
       x = 10, Sally's age NOW. Joe age NOW is 15.  (10+5) 

CHECKING our Answer***
15 + 15 = 3*10