What is the composition (in per cent) of brass alloy?
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Brass is an alloy made primarily of copper and zinc. The proportions of the copper and zinc are varied to yield many different kinds of brass. Basic modern brass is $67 \%$ copper and $33 \%$ zinc. However, the amount of copper may range from $55 \%$ to $95 \%$ by weight, with the amount of zinc varying from $5 \%$ to $40 \%$
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