Multiple choice

A mixture of 70 liters of alcohol and water contains 10 % of water. How much water must be added to the above mixture to make the water 12.5 % of the resulting mixture? 70 लीटर एल्कोहल और पानी के एक मिश्रण में पानी की मात्रा 10% है। उपरोक्त मिश्रण में कितना पानी अवश्य मिलाया जाय जिससे कि प्राप्त मिश्रण में पानी की मात्रा 12.5% हो जाये?

  1. 3.3 liters 3.3 लीटर

  2. 3 liters 3 लीटर

  3. 2.8 liters 2.8 लीटर

  4. 2 liters 2 लीटर

  5. 1.5 liters 1.5 लीटर
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initial mixture: 70 liters with 10% water = 7 liters water, 63 liters alcohol. Let x liters water be added. New mixture: 70 + x liters total, 7 + x liters water. For water to be 12.5%: (7 + x)/(70 + x) = 0.125. Solving: 7 + x = 8.75 + 0.125x, 0.875x = 1.75, x = 2. Adding 2 liters gives: 72 total, 9 water = 12.5%. Option D is correct.

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