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      Question

      A container has  30 litres  of a mixture of milk and

      water in the ratio  2 : 1 . How many litres of  water  must be added so that the new ratio of milk to water becomes  2 : 2  (i.e., 1 : 1)?
      A 10 L Correct Answer Incorrect Answer
      B 18 L Correct Answer Incorrect Answer
      C 12 L Correct Answer Incorrect Answer
      D 25 L Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total = 30 L, Milk : Water = 2 : 1 Milk = (2/3) × 30 = 20 L Water = 10 L Let x litres of water be added. New water = 10 + x Milk remains 20 L. We want milk : water = 1 : 1 → 20 : (10 + x) = 1 : 1 So 10 + x = 20 → x = 10 L

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