The purity of gold is regulated by law and is the same in all parts of the world.Exercises 21–24 show the purity of 24-kt (karat), 18-kt, 14-kt, and 10-kt gold bycomparing the parts of gold to the parts of alloy (metals other than gold). Write afraction in lowest terms to show the portion that is gold. (Source: Costco Wholesale.)
18 kt. = (18 parts gold, 6 parts alloy)
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