SOLUTION: A father is three times as old as the son .Nine year ago,the father was four times as old as the son find their age.

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Question 898106: A father is three times as old as the son .Nine year ago,the father was four times as old as the son find their age.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
f and s

f=3s
and
f-9=4%28s-9%29

f-9=4s-36
f=4s-36%2B9
f=4s-27
Substitute
3s=4s-27
-s=-27
highlight%28s=27%29
-
f=3%2A27
highlight%28f=81%29