SOLUTION: The floor of a rectangular room is completely covered with square tiles. The room is 9 tiles long and 5 tiles wide. Find the number of tiles that touch the walls or door of the roo
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Question 1147967: The floor of a rectangular room is completely covered with square tiles. The room is 9 tiles long and 5 tiles wide. Find the number of tiles that touch the walls or door of the room. Answer by Theo(13342) (Show Source):
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the room is 9 tiles by 5 tiles.
the perimeters is therefore 2 * 9 + 2 * 5 = 18 + 10 = 28 tiles.
the 4 corner tiles, however, are being double counted, so subtract them from the total to get a total of 24 tiles that touch either the floor or the door.
