SOLUTION: Gustav’s father is seven times as old as he is. One year ago, he was nine times as old as Gustav. Find Gustav’s present age.

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Question 633351: Gustav’s father is seven times as old as he is. One year ago, he was nine times as old as Gustav. Find Gustav’s present age.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
f=7g
f-1=9*(g-1)
7g-1=9g-9
8=2g
g=4
f=28
check
27=9*3
ok