Multiple choice

In 10L mixture of milk and water how much pure milk is to added so that water is reduced from 5% to 2%? 10 लीटर दूध और पानी के मिश्रण में कितना शुद्ध दूध मिला दिया जाये कि पानी 5% से घट कर 2% हो जाये?

  1. 15

  2. 10

  3. 5

  4. 20
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A Correct answer
Explanation

Initial mixture: 10L with 5% water = 0.5L water, 9.5L milk. After adding x liters of milk, total volume = 10+x liters. Water percentage becomes 0.5/(10+x) = 2% = 0.02. Solving: 0.5 = 0.02(10+x) → 0.5 = 0.2 + 0.02x → 0.02x = 0.3 → x = 15L.

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