Multiple choice

There is 81 litres pure milk in a container. One third of milk is replaced by water in the container. Again one third of mixture is extracted and equal amount of water is added. What is the ratio of milk to water in the new mixture?

  1. 1 :2

  2. 1 : 1

  3. 2 : 1

  4. 4 : 5

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Start: 81L milk. First replacement: remove 27L milk, add 27L water → 54L milk, 27L water. Second extraction: remove 1/3 of mixture (27L total, with 18L milk and 9L water), add 27L water → 36L milk, 45L water. Ratio = 36:45 = 4:5. Option D matches.

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