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An 18-karat gold necklace is 75% gold by mass, 16% silver, and 9.0% copper. what is the mass, in grams, of the necklace if it contains 0.28oz of silver?
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An 18-karat gold necklace is 75% gold by mass, 16% silver, and 9.0% copper. what is the mass, in gra...
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