Mr. harper had 506 apples at his fruit stand. his freind gave him 87 more apples, and he bought another 59 apples. how many does he have all together? buy using computation

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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