SOLUTION: Danny's father is 4 times as old as Danny. Five years ago, Danny's father was 5 times older. How old is Danny?

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Question 850502: Danny's father is 4 times as old as Danny. Five years ago, Danny's father was 5 times older. How old is Danny?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
f=4d,
f-5=5*(d-5)
4d-5=5d-25
20=d
f=80
75=5*15
75=75
ok