Vessel A contains a mixture of Apple and Orange juice in the ratio of 7:5, while Vessel B contains a mixture of Orange and Grapes juice in the ratio of 4:5. The amount of Apple juice in Vessel A is 30% less than the amount of Grapes juice in Vessel
B. The overall ratio of the mixtures in Vessel A to Vessel B is x: y. Additionally, Vessel C holds a mixture of milk and water in the ratio of y: x, and Vessel D has a mixture of milk and water in the ratio of 17:8. If 50 liters from Vessel C are transferred to Vessel D, the ratio of milk to water in Vessel D changes to 49:26. Determine the quantity of milk in Vessel
D.