In a mixture of 40 litres, the ratio of milk and water is 3 : 2. How many litres of milk must be added to make the ratio 4 : 1?

In a mixture of 40 litres, the ratio of milk and water is 3 : 2. How many litres of milk must be added to make the ratio 4 : 1?
1). 45
2). 40
3). 35
4). 30

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