Posted by William on Thursday, September 30, 2010 at 4:47pm.
Andy and William work together to build a toy house. It will take William 5 hours and Andy 4 hours, or William 10 hours and Andy 2 hours to finish their work. If William works alone, how many hours will it take to finish his work?
I say 15 is the answer.

Answer Check Please  MathMate, Thursday, September 30, 2010 at 5:17pm
Correct!
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