document.write( "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? \n" ); document.write( "
Algebra.Com's Answer #571010 by TimothyLamb(4379)\"\" \"About 
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x = oz of 24K gold
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\n" ); document.write( "1.0x + 0.5833*24 = 0.90*(x + 24)
\n" ); document.write( "x + 0.5833*24 = 0.90x + 0.90*24
\n" ); document.write( "x - 0.90x = 0.90*24 - 0.5833*24
\n" ); document.write( "0.10x = 0.90*24 - 0.5833*24
\n" ); document.write( "x = (0.90*24 - 0.5833*24)/0.10
\n" ); document.write( "x = 76.008
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\n" ); document.write( "answer:
\n" ); document.write( "about 76 oz of 24K gold must be added
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