The ratio of copper and zinc in alloy A is $4 : 5$ and in alloy B is $5 : 2$. If equal quantities of both alloys are melted together to form a new alloy C, what will be the ratio of copper to zinc in alloy C?

Options:

• A: $73 : 53$
• B: $53 : 73$
• C: $9 : 7$
• D: $5 : 4$

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