SOLUTION: Kathy is twice as old as Lisa. Three years from now, the sum of their ages will be 42. How old is Kathy?

Question 1031873: Kathy is twice as old as Lisa. Three years from now, the sum of their ages will be 42. How old is Kathy?
Found 2 solutions by stanbon, MathTherapy:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Kathy is twice as old as Lisa. Three years from now, the sum of their ages will be 42. How old is Kathy?
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Equations:
K = 2L
K+3 + L+3 = 42
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Substitute for "K" and solve for "L":
2L + 3 + L+3 = 42
3L + 6 = 42
L + 3 = 21
Lisa = 18 yrs
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Kathy = 2L = 36 yrs
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Cheers,
Stan H.
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Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!

Kathy is twice as old as Lisa. Three years from now, the sum of their ages will be 42. How old is Kathy?

Kathy is:
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