Answers

2015-03-20T14:42:57+05:30
According to the question, 
A can do the work in 20 days
Thus work done by A in 1 day = 1/20
Similarly, work done by B in 1 day = 1/30

So, when both A and B work together, work done
= 1/20 + 1/30
= 5/60 = 1/12
Work done by A and B in 7 days = 7 x 1/12 = 7/12
Work left to done = 1 - 7/12 = 5/12

According to question, C does 5/12 of the work in 10 days
Thus work done by C in 1 day = 5/12 x 1/10 = 1/24
As C does 1/24 of the work in 1 day, he does the whole of the work in 24 days

Hope that helps !!
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