Posted by Patti on Tuesday, September 28, 2010 at 6:41am.
Andy and William work together to build a toy house. It will take William 6 hours and Andy 4 hours, or William 10 hours and Andy 2 hours to finiah their work. If William works alone how many hours will it take to finish his work?

Math  ritu, Friday, January 29, 2016 at 5:17pm
how do this
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