SOLUTION: Evan is 6yrs old. His sister rachel is 15yrs old. How old will they both be when evan is half as old as his sister?

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Question 1060568: Evan is 6yrs old. His sister rachel is 15yrs old. How old will they both be when evan is half as old as his sister?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
the difference is always 9.
--> 9 & 18