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Question

'Ankit' can complete some work alone in 35 days. 'Amit' is twice as efficient as 'Sumit' and four times as efficient as 'Ankit'. If 'Ankit' and 'Sumit' start working together, then after how many days should 'Amit' replace them so that the work gets completed in exactly 12 days?

A 5 days

B 12 days

C 9 days

D 10 days

E None of these

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