SOLUTION: Kevin is 4 times as old as Michael and is also 9 years older than Michael. How old is kevin?

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Question 984478: Kevin is 4 times as old as Michael and is also 9 years older than Michael. How old is kevin?
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
Hi there,
Kevin is 4 times as old as Michael
K = 4M
Kevin is also 9 years older than Michael.
K = 9 + M
Replace K with 4M
4M = 9 + M
Collect like terms
4M - M = 9
3M = 9
M = 3
Kevin is 12 years old.
Hope this helps :-)