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Question

Working alone, ‘X’ and ‘Y’ can complete a work in 16 days and 10 days, respectively. They started working together but after 4 days, ‘Y’ was replaced by ‘Z’ and the work got finished in the next 4 days. Find the time taken by ‘Z’ alone to finish the whole work.

A 38 days

B 40 days

C 48 days

D 50 days

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