SOLUTION: The sum of Sally and Beth age is 60.Six years ago,Sally was 3 times as old as Beth.What are thier present age?

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Question 1039609: The sum of Sally and Beth age is 60.Six years ago,Sally was 3 times as old as Beth.What are thier present age?
Answer by addingup(3677) About Me  (Show Source):
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S+B = 60 subtract B from both sides:
S = 60-B
S-6 = 3(B-6)
60-B-6 = 3B-18
54 = 4B-18
72 = 4B
B = 72/4 = 18 Beth is 18 and Sally is:
60-18 = 42