SOLUTION: Gold coin is usually 90% gold and 10% copper. How many ounces of pure gold (24K) must be added to 24 ounces of a 14 carat (58.33% pure), gold ring to make an alloy of gold coin?

Question 937616: Gold coin is usually 90% gold and 10% copper. How many ounces of pure gold (24K) must be added to 24 ounces of a 14 carat (58.33% pure), gold ring to make an alloy of gold coin?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = oz of 24K gold
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1.0x + 0.5833*24 = 0.90*(x + 24)
x + 0.5833*24 = 0.90x + 0.90*24
x - 0.90x = 0.90*24 - 0.5833*24
0.10x = 0.90*24 - 0.5833*24
x = (0.90*24 - 0.5833*24)/0.10
x = 76.008
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answer:
about 76 oz of 24K gold must be added
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