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      Question

      A vessel contains mixture of milk and water mixed

      in the ratio 5:4, respectively. 90 litres of the mixture is replaced with 30 litres of water such that the quantities of milk and water in the resultant mixture become equal. Find the initial quantity of mixture in the vessel.
      A 375 litres Correct Answer Incorrect Answer
      B 360 litres Correct Answer Incorrect Answer
      C 286 litres Correct Answer Incorrect Answer
      D 240 litres Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the initial quantities of milk and water in the vessel be 5x litres and 4x litres respectively.
      90 litres mixture contains 50 litres milk and 40 litres water.
      According to question:
      5x – 50 = 4x – 40 + 30
      x = 40
      So the initial quantity of mixture = 9 × 40 = 360 litres

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