Multiple choice

In a 100 litre of mixture the ratio of milk and water is 7:3. How much milk must be added to the mixture in order to make the ratio 3 : 1?

  1. 20 litre

  2. 25 litre

  3. 30 litre

  4. 35 litre

  5. 18 litre
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Initial: 100L mixture with milk:water = 7:3, so milk = 70L, water = 30L. Let x liters of milk be added. New ratio = (70+x)/(30) = 3/1. Solving: 70 + x = 90, so x = 20L. Adding 20L milk gives 90L milk and 30L water, which is 3:1.

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