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OpenStudy (anonymous):
suppose you wish to tile a floor that measures 18 ft by 21 ft. how many square tiles that measure 3ft on a side should you purchase for the job?
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OpenStudy (dumbcow):
Total area of floor is 21*18 Area of tile is 3^2 = 9 Number of tiles needed is Total Area/area of tile _> N = (21*18)/9 = 21*2 = 42
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