SOLUTION: It takes Mr.Chu 6 hours to paint his living room. It takes his son, Damon, 10 hours to do the same job. Mr.Chu was painting for 3 hours and then Damon joined to paint because it lo

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Question 978735: It takes Mr.Chu 6 hours to paint his living room. It takes his son, Damon, 10 hours to do the same job. Mr.Chu was painting for 3 hours and then Damon joined to paint because it looked fun. How long did it take them to finish the painting job?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
c/a+ x/a+x/b=1
(3)*1/6+ x/6+x/10=1
3*1/6+x/6+x/10=1
x/6+x/10=1-3/6
x/6+x/10=3/6
10x/60+6x/60=30/60
16x/60=30/60
16x=30
16x/60=30/60
16x=30
x=30/16
x=1.875 hours
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