Multiple choice

In a mixture of milk and water of volume 30 litres the ratio of milk and water is 7:3. How much quantity of water is to be added to the mixture to make the ratio of milk and water 1:2?

  1. 28 litres

  2. 33 litres

  3. 30 litres

  4. 24 litres

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

In 30L mixture, milk=21L (7/10 of 30), water=9L (3/10 of 30). Let x liters water be added. New ratio: 21/(9+x)=1/2. Cross-multiply: 42=9+x, so x=33 liters. Option B is correct. Verify: final water=9+33=42L, ratio 21:42=1:2.

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