SOLUTION: Ruby is 5 years older than Lisa.Five years ago the sum of their ages was 25.How old are they now?

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Question 1168230: Ruby is 5 years older than Lisa.Five years ago the sum of their ages was 25.How old are they now?
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.

They are 15 and 20 years old.


    4 seconds to solve playing with numbers mentally.