Solve the Problem Using Matrices $21 \%$ Copper to Make Jewelry $14 \%$

question 323

Multiple Choice

Solve the problem using matrices.
-Anne and Nancy use a metal alloy that is $21 \%$ copper to make jewelry. How many ounces of an alloy that is $14 \%$ copper must be mixed with an alloy that is $24 \%$ copper to form 100 ounces of the desired alloy?

• A) \(30 \mathrm { oz }\)
• B) \(70 \mathrm { oz }\)
• C) \(75 \mathrm { oz }\)
• D) \(32 \mathrm { oz }\)

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