SOLUTION: he is 21 years old

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Question 238587: he is 21 years old

Found 2 solutions by scott8148, magnifik0:
Answer by scott8148(5890) About Me  (Show Source):
You can put this solution on YOUR website!
X-10= age of eric 10 years ago
Eric is now 3 times as old as he was 10 years ago: 3(X-10)
X is his age now

3(X-10)=X
3X-30=X
2X=30
X=15

Answer by magnifik0(1) About Me  (Show Source):
You can put this solution on YOUR website!
he is 21 years old