A can do a piece of work in 20 days and ...

A can do a piece of work in 20 days and B in 30 days. They work together for 7 days and then both leave the work. Then Calone finIshes the remaining work in 10 days. In how many days will finish the full work?

25 days

30 days

24 days

20 days

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2013 TIER-II PAPER(20)
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CHAMPION PUBLICATION-2013 TIER-II PAPER(21)-EXERCISE

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