SOLUTION: a father is 30 years older than his son. three years ago he was four times as old as his son. how old is the father?

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Question 600434: a father is 30 years older than his son. three years ago he was four times as old as his son. how old is the father?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
f=s+30
f-3=4*(s-3)
f-3=4s-12
s+30-3=4s-12
x+27=4s-12
39=3x
13=s
43=f
check
40=4*10
ok