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

Answer: Option B

Initial Ratio of Milk and water = 5 : 1 = 5x : 1x
After adding 5 litres of water in the mixture, Ratio of Milk and water 5 : 2 = 5x : 2x
Water 1 unit ratio increase by adding 5 litres of water. i.e x = 5
The quantity of milk in the mixture = 5 × 5 = 25 litres