Alloy X has zinc and copper in the ratio $1 : 4$, while alloy Y has them in the ratio $2 : 3$. If equal weights of both alloys are melted together to form alloy Z, what will be the ratio of zinc to copper in alloy Z?
Options:
- A: $3 : 7$
- B: $7 : 3$
- C: $2 : 5$
- D: $4 : 9$
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