Alloys A and B contain copper and zinc in the ratio 7 ∶ 8 and 4  1, respectively. In what ratio should A and B be mixed to obtain a new alloy C containing copper and zinc in the ratio 2 1?

1
4 5
2
5 ∶ 6
3
2 ∶ 3
4
3 ∶ 4

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