A mixture contains milks and water in the ratio 5 : 1.

A mixture contains milks 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 ?

Let quantity of milk and water be 5x and x litres.
Then, 5x / (x + 5) = 5/2
∴ 10x = 5x + 25
∴ x =5
∴ Quantity of milk = 5x =25 litres