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      Question

      ┬аP can do a work in 20 days, Q in 30 days. They work

      together, but P leaves 5 days before completion. Find total time.
      A 15 Correct Answer Incorrect Answer
      B 18 Correct Answer Incorrect Answer
      C 12 Correct Answer Incorrect Answer
      D 10 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Let total time be T. (T-5)/20 + T/30 = 1 3(T-5) + 2T = 60 5T = 75 -> T = 15

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