Fred is playing tennis. for every 2 of his serves that land in, 3 serves land out. if he hit 28 serves in, how many serves landed out

Using proportions the answer should be 42.

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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