Solutions A and B contain acid and water in the ratio 4 ∶ 3 and 9 ∶ 5, respectively. Four litres of solution A is mixed with 5 litres of solution B. What is the ratio of acid and water in the resulting mixture?

1
4 ∶ 7
2
7 ∶ 4
3
11 ∶ 7
4
9 ∶ 11

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