Gold dealers measure the purity of gold by carats (kt.). 24-karat is pure gold; hence, 12-karat gold is 50% gold. if ramzi mixes some 24-karat gold with some 12-karat gold to make 50 oz. of 21-karat gold, then how many ounces of 24-karat gold did he use?

step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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step-by-step explanation: