How much water must be added to 14 litres of milk worth Rs 5.40 a litre so that the value of the mixture may be Rs 4.20 a litre?

7 litres

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6 litres

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5 litres

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4 litres

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None of the above

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Solution

The correct option is D 4 litres

Water is free, its cost can be taken as 0 paise per litre. By the method of alligation, the ratio of water and milk is 2:7, i.e., with 7 litres of milk, 2 litres of water is added, with 14 litres, water added is 4 litres.

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