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A 48-litre mixture contains milk and water in the ratio 3:1 respectively. If 10 litres of the mixture is taken out and 20 litres of water is added to the remaining mixture, what is the difference between milk and water in the final mixture (in litres)?

1. 1
2. 0.5
3. 2
4. 1.5

Correct answer: 1

Solution

Initially, milk = 36 L and water = 12 L. Removing 10 L of the mixture removes milk and water in the ratio 3:1, so 7.5 L milk and 2.5 L water are removed; remaining milk = 28.5 L and water = 9.5 L. After adding 20 L water, water becomes 29.5 L, so the difference is 1 L.

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