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Question

A work can be completed by ‘A’ and ‘B’, alone in 15 days and 20 days, respectively. Find the number of days taken by ‘C’ to complete the same work alone if ‘A’, ‘B’ and ‘C’ together can complete the whole work in 4 days.

A 7.5 days

B 3.5 days

C 4.5 days

D 6.5 days

E None of these

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