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      Question

      A container holds 260 liters of a solution of milk and

      water mixed in the ratio of 7:6 respectively. ‘x’ liters of this solution is drawn out and replaced by 20 liters of water. If the resulting mixture has milk to water in the ratio 4:5, what is the value of ‘x’?
      A 70 liters Correct Answer Incorrect Answer
      B 52 liters Correct Answer Incorrect Answer
      C 45 liters Correct Answer Incorrect Answer
      D 90 liters Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      260 liters of solution contains 140 liters of milk and 120 liters of water.

      x liters of solution contains (7x/13) liters of milk and (6x/13) liters of water.

      (140 – 7x/13) / (120 – 6x/13 + 20) = 4/5

      (1820 – 7x) / (1820 – 6x + 260) = 4/5

      (1820 – 7x) / (2080 – 6x) = 4/5

      5(1820 – 7x) = 4(2080 – 6x)

      9100 – 35x = 8320 – 24x

      11x = 780

      x = 70

      So, the value of ‘x’ is 70 liters.

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