SOLUTION: Peter is now three times as old as John. Three years ago the sum of their ages was 22. How old is John now?

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Question 739677:
Peter is now three times as old as John. Three years ago the sum of their ages was 22. How old is John now?
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
P=3J
P-3+J-3=22
3J-3+J-3=22
4J=22+3+3
4J=28
J=28/4
J=7 YEARS OLD FOR JOHN NOW.
P=3*7=21 YEARS OLD FOR PETER NOW.
PROOF:
21-3+7-3=22
17+4=21
21=21