In vessel A, there is X liters of milk, and in vessel B, there is Y liters of water. 60% of the milk from vessel A and 50% of the water from vessel B are poured into vessel C. The ratio of milk to water in vessel C is 3:1. If 10 liters of milk are added to vessel C, then the total amount of the mixture in vessel C becomes 70 liters. Find the ratio of X to Y before pouring 10 litres of milk in vessel C.