The ratio of alcohol to water in three types of drugs of equal quantity is 2 ∶ 5, 5 ∶ 9, and 8 ∶ 13 respectively. An equal quantity of all three drugs is mixed. Find the ratio of alcohol to water after mixing 

1
34 ∶ 38
2
12  19
3
43  83
4
57  61

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