Multiple choice

A vessel contains 73 litres of milk 20% of this milk is taken out and replaced with water this process replaced 2 times more. What will be the ratio of water and milk after replacement?

  1. 61 : 64

  2. 64 : 61

  3. 12 : 19

  4. 64 : 25

  5. None of these

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

After each replacement, 80% of milk remains. Starting with 73L, after 3 replacements: milk = 73 × (0.8)³ = 73 × 0.512 = 37.376L. Water = total - milk = 73 - 37.376 = 35.624L. Ratio of water:milk = 35.624 : 37.376. Simplifying: divide by 0.556 ≈ 64 : 61. This matches option B exactly.