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A and B can do a piece of work in 30 day...

A and B can do a piece of work in 30 days, while B and C can do the same work in 24 days and C and A in 20 days. They all work together for 10 days when B and C leave. How many days more will A take to finish the work ? `18\ d a y s` b. `\ 24\ d a y s` c. `30\ d a y s` d. `36\ d a y s`

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