4.5 gram of an alloy of copper and zinc contains 3.5 gram of copper. what weight of copper will there be in 18.9 gram of the alloy?
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4.5 g contains 3.5 g of Cu
therefore 18.9 g of alloy contains 3.5/4.5*18.9
=7/9*18.9
=7*2.1
=14.7g of Cu
therefore 18.9 g of alloy contains 3.5/4.5*18.9
=7/9*18.9
=7*2.1
=14.7g of Cu
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