SOLUTION: Manuel is 25 years old and his brother is 19. How many years ago was Manuel four times as old as David. I need help with how to set up the equation.

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Question 812588: Manuel is 25 years old and his brother is 19. How many years ago was Manuel four times as old as David. I need help with how to set up the equation.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Manuel is 25 years old and his brother is 19. How many years ago was Manuel four times as old as David.
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Assume the answer is "x" years.
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Equation:
25-x = 4(19-x)
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25-x = 76 - 4x
3x = 51
x = 17 years
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Cheers,
Stan H.
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