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Q: A, B and C can complete a work in 10, 15 and 20 days respectively. A and B start it together. B is replaced by C after 2 days. A leave it after one more day. In how many days work was completed?

  • 1
    13
  • 2
    \(13 {1 \over 13 }\)
  • 3
    \(18 {4 \over 3 }\)
  • 4
    18
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Answer : 2. " \(13 {1 \over 13 }\)"

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