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      Question

      A can complete a piece of work in 10 days and B can

      complete the same work in 15 days. If both work together, in how many days will the work be completed?
      A 2 days Correct Answer Incorrect Answer
      B 7 days Correct Answer Incorrect Answer
      C 12 days Correct Answer Incorrect Answer
      D 6 days Correct Answer Incorrect Answer

      Solution

      Let total work = LCM of 10 and 15 = 30 units A’s 1-day work = 30 Γ· 10 = 3 units B’s 1-day work = 30 Γ· 15 = 2 units Together in 1 day = 3 + 2 = 5 units Time to finish 30 units = 30 Γ· 5 = 6 days Answer: 6 days

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