A shopkeeper makes a 25% profit by selling a mixture of two types of milk at ₹15 per litre. If the cheaper milk costs ₹12 per litre and was mixed with pure water (free of cost), what is the ratio of milk to water?

The selling price of the mixture is 15 rupees per litre to achieve a 25 percent profit, making the cost price of the mixture 15 divided by 1.25, which equals 12 rupees per litre. Using the rule of alligation with the cost of milk at 12 rupees and water at 0 rupees, the ratio of their quantities is (12 minus 12) to (12 minus 0). This simplifies to a milk to water ratio of 3 to 1.

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