The ratio of copper and zinc in an alloy is 9:5 if the weight of zinc in the alloy is 9.5g, what is the weight of copper in it?
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let the weight of copper is 9x g and weight of zinc is 5x g
so, 5x=9.5
=> x=9.5/5
=> x=1.9
so 9x=9*1.9=17.1
=> weight of copper is 17.1 g
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