In a 150-liter mixture, the ratio of milk to water is (y + 3) : (2y - 4). If 30 liters of the mixture is removed, and then 20 liters of milk is added, resulting in a final ratio of 4 : 3 for milk and water, what was the quantity of water in the initial mixture?
1
50 liters
2
120 liters
3
90 liters
4
75 liters
5
80 liters