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Q:

To do a certain work, the ratio of the efficiencies of A and B is 7: 5. Working together, they can complete the same work in $$17{1\over 2}$$ days. A alone will complete 60% of the same work in:

  • 1
    18 days
  • 2
    15 days
  • 3
    16 days
  • 4
    21 days
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Answer : 1. "18 days"

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