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      Question

      A mixture (acetone and water) contains 40% acetone and

      rest 96 litres water. How much acetone should be added to the mixture to make the ratio of acetone to water in the mixture 5:6?
      A 16 litres Correct Answer Incorrect Answer
      B 10 litres Correct Answer Incorrect Answer
      C 14 litres Correct Answer Incorrect Answer
      D 13 litres Correct Answer Incorrect Answer
      E 18 litres Correct Answer Incorrect Answer

      Solution

      Initial quantity of acetone in the mixture = 96 × (0.4/0.6) = 64 litres
      Let the quantity of acetone added be ‘x’ litres
      According to the question,
      (64 + x)/96 = 5/6
      => x = 80 – 64 = 16
      Therefore, quantity of acetone added = 16 litres

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