Multiple choice

In a five-litre mixture of milk and water the portion of water is 30%. How much milk should be added to the mixture so that the portion of water reduces to 5%?

  1. 15 liter

  2. 20 liter

  3. 22 liter

  4. 25 liter

  5. 29 liter

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initial water is 30% of 5L = 1.5L. When milk is added, water amount stays constant but total volume increases. Set up 1.5 / (5 + x) = 0.05, where x is milk added. Solving gives x = 25L.