In a 64 litres mixture, the alcohol and water are in the ratio of 1 ∶ 3 respectively. 32 liters of mixture is taken off and replaced with 16 liters of water. What is the new ratio of alcohol and water respectively? 

1
1 ∶ 5
2
2 ∶ 7
3
3 ∶ 10
4
5 ∶ 12

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