Mathematics · Mixtures and Alligations

The ratio of the capacities of 3 containers is 3 : 2 : 1. Each container is filled to its maximum capacity with a mixture of milk and water. The ratios of milk and water in the three containers are 7 : 5, 5 : 3, and 1 : 3 respectively. One liter of mixture from each of the three containers is taken out and mixed in a new container, where the ratio of milk and water becomes x : y. If the entire mixture from each of the containers at full capacity is mixed in another new container, the ratio of milk and water is p : q. Then, xpyq =