SOLUTION: Alan is 4 times Peter's age. 12 years ago, he was 7 times as old. What are their ages now?

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Question 1002732: Alan is 4 times Peter's age. 12 years ago, he was 7 times as old. What are their ages now?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Call their ages NOW, a and p.
a = 4p
a-12=7(p-12)=7p-84
or
a = 7p - 72
Substituting in we get
4p = 7p - 72
-3p = -72
p = 24
a = 96