SOLUTION: How do I write this problem into an equation: Sean is 20 and his brother is 12. How many years ago was Sean three times as old as his brother?

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Question 240776: How do I write this problem into an equation:
Sean is 20 and his brother is 12. How many years ago was Sean three times as old as his brother?
Answer by edjones(7311) About Me  (Show Source):
You can put this solution on YOUR website!
Let x be the number of years past.
(20-x) / (12-x) = 3
.
Ed