12 litres of alcohol-water mixture of the ratio 5 ∶ 1 is mixed with 10 litres of another alcohol-water mixture of the ratio 2 ∶ 3. How much more water is to be added to obtain a final mixture of the ratio 7 ∶ 6?

1
1 litre
2
2 litres
3
3 litres
4
4 litres

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