Answer : 3 [6 (261/315)] days Explanation : Answer: C) [6 (261/315)] days Explanation: After day 1, A finishes 1/9 of the work.After day 2, B finishes 1/7 more of the total work. (1/9) (1/7) is finished.After day 3, C finishes 1/5 more of total work. Total finished is 143/315.So, after day 6, total work finished is 286/315. Now remaining work = 29 /315 On day 7, A will work again Work will be completed on day 7 when A is working. He must finish 29/315 of total remaining work. Since he takes 9 days to finish the total task, he will need 261/315 of the day. Total days required is 6 (261/315) days.

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