Multiple choice

A mixture contains milk and water in the ratio of 5 : 1. On adding 15L of water, the ratio of milk and water becomes 5 : 2. What is the quantity of milk in the original mixture?

  1. $15 L$
  2. $75 L$
  3. $82.5 L$
  4. $97.5 L$
  5. $90 L$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let original milk = 5x, water = x. Total = 6x. After adding 15L water: 5x/(x+15) = 5/2. Cross-multiply: 10x = 5x + 75, so 5x = 75, x = 15. Milk quantity = 5×15 = 75L.