Multiple choice

A mixture contains 25\% milk and rest water. What percent of this mixture must taken out and replaced with milk so that in mixture milk and water may become equal.

  1. 25%

  2. 33.33%

  3. 20%

  4. 67.67%

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial: 25% milk, 75% water. Let x fraction be removed and replaced with milk. Milk after operation: 0.25(1-x) + x = 0.25 - 0.25x + x = 0.25 + 0.75x. Water after: 0.75(1-x) = 0.75 - 0.75x. For equality: 0.25 + 0.75x = 0.75 - 0.75x, so 1.5x = 0.5, x = 0.5/1.5 = 1/3 = 33.33%. The claimed answer B is correct.

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