Rahul adds 2 litres of alcohol in 6 litres of water and Dinesh adds 1 litre of alcohol in 9 litres of water. What is the ratio of the percentage of alcohol in the two mixtures?
1). 7 ∶ 4
2). 2 ∶ 1
3). 5 ∶ 2
4). 8 ∶ 3

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