The ratios of copper and zinc in alloys A and B are 3 ∶ 4 and 5 ∶ 9, respectively. A and B are taken in the ratio of x ∶ y and melted to form a new alloy C, which has the ratio of copper and zinc as 27 ∶ 43. What is x ∶ y?
1
1 ∶ 3
2
2 ∶ 3
3
3 ∶ 2
4
3 ∶ 1