A alone can do a piece of work in 15 days to that of B alone can do it in 10 days. If B works at it for 5 days and then leaves, then A alone can finish the remaining work in _________.
712days
612days
6days
8days
A
612days
B
712days
C
8days
D
6days
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Solution
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A can do a work in 15 days
A can do 115 work in 1 days
B can do a work in 10 days
B can do 110 work in 1 day
If B works for 5 days
∴ B does 5×110=12 work
Remaining work =1−12=12
A can do 1 work in 15 days
A can do 12 work in 152=712 days.
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