SOLUTION: Susan is twice as old as Lana. The sum of their ages 4 years ago was 37. Find how old they are now.

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Question 1151500: Susan is twice as old as Lana. The sum of their ages 4 years ago was 37. Find how old they are now.
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
Susan, 30
Luna, 15

If L is for Luna's age now, then %282L-4%29%2B%28L-4%29=37, and with simple steps, L=15.