SOLUTION: A father is 5 times as old as his son. In 18 years, the father will be twice as old as his son. How is old is the father at present?

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Question 805118: A father is 5 times as old as his son. In 18 years, the father will be twice as old as his son. How is old is the father at present?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
f=5s,
f+18=2*(s+18)
5s+18=2*(s+18)
5s+18=2s+36
3s=18
s=6
f=30
dad is 30 now