SOLUTION: Roger's age is two times the age of his sister. Last year his age was three times the age of his sister. How old is roger?

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Question 909624: Roger's age is two times the age of his sister. Last year his age was three times the age of his sister. How old is roger?
Answer by stanbon(75887) About Me  (Show Source):
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Roger's age is two times the age of his sister. Last year his age was three times the age of his sister. How old is roger?
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Equations:
r = 2s
r-1 = 3(s-1)
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Substitute for "r" and solve for "s"::
2s-1 = 3s-3
s = 2 (Sister's age)
r = 2s = 4 (Roger's age )
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Cheers,
Stan H.
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