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      Question

      A and B can do a piece of work in 18 days, B and C in 24

      days, A and C in 36 days. Working together they can do the work in
      A 12 days Correct Answer Incorrect Answer
      B 13 days Correct Answer Incorrect Answer
      C 16 days Correct Answer Incorrect Answer
      D 26 days Correct Answer Incorrect Answer

      Solution

      ATQ, A and B together can do the work in 18 days, so their combined rate is (1/18) B and C together can do the work in 24 days, so their combined rate is (1/24) A and C together can do the work in 36 days, so their combined rate is (1/36) Adding these rates: This simplifies to: So, A+B+C = (1/16) Thus, working together, A, B, and C can complete the work in 16 days.

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