The ratio of acid and water in solution A is 1 ∶ 5 and that in solution B is 2 ∶ 7. If equal quantities of both the solutions are mixed, then what will be the ratio of acid and water in the new solution?

1
1 ∶ 4
2
3 ∶ 10
3
7 ∶ 29
4
21 ∶ 29

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