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?]

Algebra ->  Equations -> 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?]      Log On


   

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) About Me  (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.