Aclass of 195 students went on a field trip. they took 7 vehicles, some cars and some buses. find the number of cars and the number of buses they took if each car holds 5 students and each bus holds 45 students

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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