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A and B can separately do a piece of wor...

A and B can separately do a piece of work in 20 and 15 days respectively. They worked together for 6 days, after which B was replaced by C. If work was finished in next 4 days, then the number of days in which C alone could do the work will be a. `30` b. `40` c. `35` d. `60\ `

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