Four rectangular placemats, each with a perimeter of 36 inches, are on a square table that is 4 feet long. If the placemat is 12 inches long, what is the area of the table not covered by the four placemats?

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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answer: 42

use a calculator to find that 845/73 = 11.575

the whole part of the answer is 11. multiply this by 73 to get 11*73 = 803.

subtract that result from 845 to get 845 - 803 = 42

answer: x=60