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P and Q do a work in 21 days. Q and R do that work in 35 days, whereas R and P complete the

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P and Q do a work in 21 days. Q and R do that work in 35 days, whereas R and P complete the same work in 28 days. In how many days P alone can complete the work? 1. 840/23 2. 840/21 3. 830/19 4. 810/18 5. None of these

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