purity of Gold The purity of gold is measured in karats, with pure gold being 24 karats. O...

purity of Gold The purity of gold is measured in karats, with pure gold being 24 karats. Other purities of gold are expressed as proportional parts of pure gold. Thus, 18-karat gold is , or 75% pure gold; 12-karat gold is  or 50% pure gold; and so on. How much 12-karat gold should be mixed with pure gold to obtain 60 grams of 16-karat gold?