SOLUTION: father say to his son seven years ago i was 7 times as old as you were but 3 years hence my age will be twice that of yours .find their ages?

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Question 176620: father say to his son seven years ago i was 7 times as old as you were but 3 years hence my age will be twice that of yours .find their ages?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
let the father and son's ages be f and s respectively
:
f-7=7(s-7).....eq 1
f+3=2(s+3).....eq 2
:
rewrite eq 2 to f+3=2s+6--->f=2s+3..now plug this value into eq 1
:
2s+3-7=7s-49
:
-5s=-45
:
highlight%28s=9%29son's age
:
highlight%28f=2s%2B3=2%289%29%2B3=21%29father's age