A mixture contains milk and water in the ratio $5:1.$ On adding $5$ litres of water, the ratio of milk to water becomes $5:2.$ The quantity of milk in the original mixture is

Let the initial quantities of milk and water be 5x and 1x respectively. After adding 5 liters of water, the new ratio becomes 5x divided by the sum of x and 5, which equals 5 divided by 2. Solving for x gives x equal to 5, so the original quantity of milk is 5x, or 25 litres.

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