SOLUTION: Working Together,Doug and Barbara can do a job in 6 hours. Barbara is able to do the job in 10 hours. How long does it take Doug to do the job if he works alone?
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Question 82467: Working Together,Doug and Barbara can do a job in 6 hours. Barbara is able to do the job in 10 hours. How long does it take Doug to do the job if he works alone? Answer by checkley75(3666) (Show Source):
You can put this solution on YOUR website! 6=10X/(10+X) CROSS MULTIPLY
6(10+X)=10X
60+6X-10X=0
-4X=-60
X=-60/-4
X=15 HOURS FOR DOUG TO DO THE JOB ALONE.
PROOF
6=10*15/(10+15)
6=150/25
6=6
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