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Question

‘M’ is 60% more efficient than ‘N’. ‘N’ started the work alone and worked for 12 days and after that ‘N’ is replaced by ‘M’. If the total work is completed in 40 days, find the time taken by ‘M’ to finish the same work alone?

A 30.5 days

B 31.5 days

C 35.5 days

D 25.5 days

E None of these

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