729 - Math - Problem Solving

Question: A sample of x litres from a container having a 60 litre mixture of milk and water containing milk and water in the ratio of 2 : 3 is replaced with pure milk so that the container will have milk and water in equal proportions. What is the value of x?

1. 6 litres
2. 10 litres
3. 30 litres
4. None of these