SOLUTION: Serena is nine years old. Her mother is 39 years old. In how many years will her mother be three times as old as Serena?

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Question 656993: Serena is nine years old. Her mother is 39 years old. In how many years will her mother be three times as old as Serena?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Serena is nine years old. Her mother is 39 years old. In how many years will her mother be three times as old as Serena?
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s = 9
m = 39
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Let the "number of years" asked for be "x".
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Equation:
39 + x = 3(9 + x)
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39 + x = 27 + 3x
2x = 12
x = 6 years
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Cheers,
Stan H.