SOLUTION: Father' age was 7 times his son 5 years ago. After five years, he will be 3 times his son. What is the age of father?

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Question 807525: Father' age was 7 times his son 5 years ago.
After five years, he will be 3 times his son.
What is the age of father?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
(f-5)=7*(s-5),
(f+5)=3*(s+5)
f = 40, s = 10