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Brass is a metal alloy made of zinc and copper. Different types of brass are made...

Brass is a metal alloy made of zinc and copper. Different types of brass are made by varying the amount of copper and zinc in the alloy. Yellow brass is made of 33% zinc. If a musical instrument is made of yellow brass and weighs 3.28 kg, how many kilograms of copper does this instrument contain?

9.9 kg Cu
4.9 kg Cu
0.49 kg Cu
1.1 kg Cu
2.2 kg Cu
0.99 kg Cu
0.099 kg Cu
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