In a mixture of 80 litres, milk and water are in the ratio 2:3. If 25% of the mixture is replaced with the same amount of milk, then what is the amount of milk in the final mixture?

44 litres
46 litres
54 litres
56 litres

Correct answer: 44 litres

Solution

Initially, milk = 02/5 of 80 = 32 litres. When 25% of 80 litres = 20 litres of mixture is removed, milk removed = 2/5 of 20 = 8 litres, so milk left = 24 litres. Adding 20 litres of pure milk gives 44 litres.

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