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      Question

      ‘A’ and ‘B’ can do a piece of work in 12 days

      and 20 days, respectively. They started working together but ‘A’ left after 6 days. Find the time taken by ‘B’ to complete the remaining work.
      A 4 days Correct Answer Incorrect Answer
      B 2 days Correct Answer Incorrect Answer
      C 5 days Correct Answer Incorrect Answer
      D 7 days Correct Answer Incorrect Answer

      Solution

      Let total amount of work be 60 units (LCM of 12 and 20). Efficiency of ‘A’ = 60/12 = 5 units/day Efficiency of ‘B’ = 60/20 = 3 units/day Amount of work done by ‘A’ and ‘B’ together in 6 days = (5 + 3) × 6 = 48 units Time taken by B to complete remaining work = {(60 – 48)/3} = 4 days

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