SOLUTION: I'm having trouble figuring out this problem to MAKE 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 168458This question is from textbook KetyTo Algebra
: I'm having trouble figuring out this problem to MAKE an equation: [Sean is 20 and his brother is 12. How many years ago was Sean three times as old as his brother?]
This question is from textbook KetyTo Algebra
Answer by midwood_trail(310) (Show Source): You can put this solution on YOUR website!
The equation is:
20 - x = 3(12 - x)
20 - x = 36 - 3x
20 - 36 = x - 3x
-16 = -2x
-16/-2 = x
8 = x
Answer is 8 years ago.
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