SOLUTION: Mary is now three as old as susan. Three years ago, the sum of their ages was 22. How old is susan now?

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Question 370019: Mary is now three as old as susan. Three years ago, the sum of their ages was 22. How old is susan now?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Susan's age now = s. Then Mary's age is 3s. Then
(s-3)+(3s-3) = 22,
4s-6 = 22,
4s = 28,
s = 7, the age of susan now;
3s = 21, the age of Mary now.