SOLUTION: in 12 years he will be three times as old as he was 30 years ago

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Question 670717: in 12 years he will be three times as old as he was 30 years ago
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
X+12=3(X-30)
X+12=3X-90
X-3X=-90-12
-2X=-102
X=-102/-2
X=51 YEARS OLD ANS.
PROOF:
51+12=3(51-30)
63=3*21
63=63