If three years ago the sum of their ages was 39, and jack is twice as old as lacy, how old are they now?

Jack is two times as old as lacy. Three years ago the sum of their ages was 39. How old are they now?
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Let L=Lacy’s Age now, then Jack’s age now is 2L.

L-3+2L-3=39, 3L-6=39, 3L=45, L=15 so Lacy is 15 and Jack is 30.
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