Multiple choice

How much quantity of water should be added to a 75 litre mixture of milk and water so that the percentage of milk in the mixture decrease from 75% to 45%? 75 लीटर दूध और पानी के मिश्रण में कितनी मात्रा में पानी मिलाना चाहिए, जिससे कि मिश्रण में दूध का प्रतिशत 75%से 45% हो जाए?

  1. 25 litre/लीटर

  2. 40 litre/लीटर

  3. 50 litre/लीटर

  4. 75 litre/लीटर
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Initial mixture: 75 litres with 75% milk, so milk = 56.25 L, water = 18.75 L. Let x litres of water be added. New mixture: (75 + x) litres with 45% milk. Milk amount unchanged: 56.25/(75 + x) = 0.45. Solving: 56.25 = 33.75 + 0.45x, so 0.45x = 22.5, giving x = 50 litres.

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