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      Question

      A is thrice as efficient as B and can finish a piece of

      work in 28 days less than B. B can finish this work in how many days?
      A 40 days Correct Answer Incorrect Answer
      B 42 days Correct Answer Incorrect Answer
      C 22 days Correct Answer Incorrect Answer
      D 20 days Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Ratio of efficiency of A and B = 3: 1
      A will take 1/3 of time as compared to B.
      Say, B takes 3x days and A takes x days.
      ∴ 3x – x = 28 ⇒ x = 14
      ∴ B takes 14 × 3 = 42 days to do the work.

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