Brass is an alloy created using $80\%$ copper and $20\%$ zinc. If Henri's brass trumpet contains 48 ounces of copper, how many ounces of zinc are in the trumpet?
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<|im_start|>user
Brass is an alloy created using $80\%$ copper and $20\%$ zinc. If Henri's brass trumpet contains 48 ounces of copper, how many ounces of zinc are in the trumpet?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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Brass is an alloy created using $80\%$ copper and $20\%$ zinc. If Henri's brass trumpet contains 48 ounces of copper, how many ounces of zinc are in the trumpet?
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