Multiple choice

From a mixture of milk and water 8 litres mixure is taken out and replaced with water , hence the percentage of water changed from 20 to 25 percent. find the initial quantity of mixture.

  1. 144 litres

  2. 136 litres

  3. 128 litres

  4. 150 litres

  5. None of these

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

Initial mixture: 80% milk, 20% water. After removing 8L and adding water: 0.8(x−8)=0.75x (milk amount unchanged). Solving: 0.8x−6.4=0.75x, so 0.05x=6.4, x=128 liters. Option C matches.