The surface area of Lake Superior, the largest of the Great Lakes, is 8 x 104 square kilometers. The surface area of the
smallest Great Lake, Ontario, is 18,160 square kilometers.
About how many times as great is the area covered by Lake
Superior than Lake Ontario?

55

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: