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Q:

P and Q can do a piece of work in 12 days, Q and R can do a piece of work in 15 days and R and P can do a piece of work in 20 days. Q alone can do the whole work in

  • 1
    25 days
  • 2
    30 days
  • 3
    20 days
  • 4
    24 days
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Answer : 3. "20 days"

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