SOLUTION: Faridah is 3 times as old as her sister. Two years ago, the difference of squares of their ages was 240. What are their present age?

SOLUTION: Faridah is 3 times as old as her sister. Two years ago, the difference of squares of their ages was 240. What are their present age?

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Question 824053: Faridah is 3 times as old as her sister. Two years ago, the difference of squares of their ages was 240. What are their present age?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
f=3s,
(f-2)^2-(s-2)^2=240
f^2-4f-s^2+4s = 240
f = 18, s = 6

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