SOLUTION: Kelly is nine years older than her sister Kelly's age is one more than twice her sisters age. whats is kelly's age?

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Question 82658: Kelly is nine years older than her sister
Kelly's age is one more than twice her sisters age.
whats is kelly's age?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Kelly is nine years older than her sister
Kelly's age is one more than twice her sisters age.
whats is kelly's age?
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Let her sister's age be "x".
Then Kelly's age is 2x+1.
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EQUATION:
Kelly's age - Sister's age = 9
2x+1-x = 9
x+1=9
x=8 (Sister's age)
2x+1 = 17 (Kelly's age)
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Cheers,
Stan H.