'A' can complete a piece of work in 20 days. 'A' and 'B' together can complete the same piece of work in 16 days.

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'A' can complete a piece of work in 20 days. 'A' and 'B' together can complete the same piece of work in 16 days. How many days are required by 'B' alone to complete the same piece of work? 1. 56 days 2. 80 days 3. 40 days 4. 64 days 5. None of these

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