Multiple choice

In a mixture of 240 litres of milk and water, water is 30%. Find the quantity of water that should be added to make the percentage of water in mixture 40%.

  1. 40 litres

  2. 45 litres

  3. 30 litres

  4. 60 litres

  5. None of these
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A Correct answer
Explanation

In 240 litres, water is 30% = 72 litres, milk is 168 litres. Let x litres of water be added. New mixture = (240 + x) litres with 40% water. So: (72 + x) / (240 + x) = 0.4. Solving: 72 + x = 96 + 0.4x, which gives 0.6x = 24, so x = 40 litres.

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