SOLUTION: Sara is twice as old as Jimmy. Three years ago, the sum of their ages was 39. How old is Jimmy now?

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S = 2J    and   (S-3)+(J-3) = 39



(2J-3) + (J-3) = 39



J = 15  -->  S = 30



Check

J-3 + S-3 = 12 + 27 = 39  (ok)