SOLUTION: Lisa’s age is twice her sisters age. The difference between their ages is eight. How old are Lisa and her sister

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Question 1178591: Lisa’s age is twice her sisters age. The difference between their ages is eight. How old are Lisa and her sister
Found 2 solutions by mananth, math_helper:
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Lisa’s age (l) is twice her sisters(s) age.
l=2s
The difference between their ages is eight.
l-s= 8
substitute l
2s-s=8
s=8
l=2s=16

Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
You should be able to easily solve this one in your head. Very little thought is needed.
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Algebraic solution:
Lisa's sister's age: x
Lisa's age: 2x
2x-x = 8
x = 8
(Lisa's sister is 8, Lisa is 16)