Multiple choice

A mixture of 40 litres of milk and water contains 10% of water. How much water must be added to make the water 20% in the new mixture?

  1. 5 litres

  2. 4 litres

  3. 3 litres

  4. None of these
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A Correct answer
Explanation

Initial mixture has 4L water (10% of 40L) and 36L milk. After adding x liters of water, total becomes (40+x) liters with (4+x) liters water. For water to be 20%: (4+x)/(40+x) = 0.20. Solving: 4+x = 8+0.2x, so 0.8x = 4, giving x = 5 litres.

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