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OpenStudy (anonymous):
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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OpenStudy (anonymous):
Total mass : Mass of (Au + Ag + Cu) Au: 75 * .28/ 16 = .. Cu: 9 * .28/ 16 = ... Can you calculate them now?
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