In a vessel, a mixture of milk and coffee is in the ratio 9 ∶ 1. If 20 liters of the mixture is taken out and same quantity of coffee is poured into the vessel, the ratio of milk and coffee becomes 5 ∶ 2. Find the original quantity of Milk in the vessel?

In a vessel, a mixture of milk and coffee is in the ratio 9 ∶ 1. If 20 liters of the mixture is taken out and same quantity of coffee is poured into the vessel, the ratio of milk and coffee becomes 5 ∶ 2. Find the original quantity of Milk in the vessel?
1). 79.3 liters
2). 82.3 liters
3). 87.3 liters
4). 77.3 liters

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