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 741174:
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 ANS. FOR JOHN'S AGE NOW.
P=3*7=21 AGE OF JOHN NOW.
PROOF:
21-3+7-3=21
28-6=22
22=22