SOLUTION: Christopher is 4 years older than Oscar. Three years ago, Christopher was 3 times as old as Oscar. How old is Oscar now?

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Question 812696: Christopher is 4 years older than Oscar. Three years ago, Christopher was 3 times as old as Oscar.
How old is Oscar now?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
c=o+4,
c-3=3*(o-3)
c = 9, o = 5