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      Question

      A can complete a work in 25 days. B takes 5 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 = 25 – 5 = 20 days Let the total work = 100 units Efficiency of A = 100/25 = 4 units/day Efficiency of B = 100/20 = 5 units/day Required time taken = 0.90 x 100/(4+5) = 10 days

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