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      Question

      A can complete a work in 20 days. B takes 10 days less

      than A to complete the same work. In how many days can both of them together complete 90% of the work together?
      A 8 days Correct Answer Incorrect Answer
      B 6 days Correct Answer Incorrect Answer
      C 10 days Correct Answer Incorrect Answer
      D 12 days Correct Answer Incorrect Answer

      Solution

      Time taken by B to complete the work = 20 – 10 = 10 days Let the total work = 20 units Efficiency of A = 20/20 = 1 units/day Efficiency of B = 20/10 = 2 units/day Required time taken = 0.90 x 20/(1+2) = 6 days

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