IBPS RRBs Officer Scale I 06 Sep 2015 Paper

In a container there is a certain quantity of mixture of water and milk in which there is 15% of water. 30 litres of mixture is taken out from the container and then 2.1 litres of water is added to the container. The resulting mixture has milk and water in the ratio 17 : 4. Find the initial quantity of the mixture in the container. (in litres)