Multiple choice

In a mixture of 84 liters the ratio of milk and water is 3:4. How much water should be added so that percentage of milk becomes 37.5\%?

  1. 15

  2. 10

  3. 8

  4. 12

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

In 84L, milk:water = 3:4, so milk = 36L, water = 48L. After adding x liters water, milk percentage = 36/(84+x) = 37.5% = 3/8. Solving: 288 = 252 + 3x, so x = 12L.