In a mixture of 120 litres of alcohol and water, the ratio of alcohol to the water is 5 ∶ 7. If 30 litres of water is added to the mixture, then find the ratio of alcohol and water in the final mixture.

1
1 ∶ 2
2
1 ∶ 4
3
3 ∶ 2
4
5 ∶ 7

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