SOLUTION: I am half my father's age. Nine years ago, I was two-fifths of his age. What fraction of his age was I nine years before that? I know its like x/2 = 2/5(x/2)... Please show me

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Question 965277: I am half my father's age. Nine years ago, I was two-fifths of his age. What fraction of his age was I nine years before that?
I know its like x/2 = 2/5(x/2)...
Please show me working as well because it helps me learn :P.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Y=F%2F2
.
.
Y-9=%282%2F5%29%28F-9%29
5%28Y-9%29=2%28F-9%29
5Y-45=2F-18
5Y=2F%2B27
Multiplying by 2
10Y=4F%2B54
Substituting from above,
5F=4F%2B54
F=54
So then,
Y=54%2F2
Y=27
You're 27, your father is 54.