Explanation

Think of the space as two rectangles: 21 ft. by 14 ft. and 10 ft. by 7 ft. (You can ﬁnd the length of the missing side of the smaller rectangle by subtracting: 24 − 14 = 10.) Use the formula A = lw to ﬁnd the area of each rectangle, and then combine to ﬁnd the total area of the ﬂoor to be carpeted:\(21 \times 14=294\), and \(7 \times 10=70\). Add the areas of the two rectangles: 294+70 = 364, so the Wrights will need to buy 364 square feet of carpeting.

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