a room measures 15 ft by 21 ft.How many square titles will be needed to cover the floor if the titles are 9 inches on a side?
15 ft = 15 ft x 12 in/ft = 180 inches will 9 inches divide evenly ?/ Yes 180 / 9 = 20
21 ft = 21 ft x 12in/ft = 252 inches will 9 divide evenly ? yes 28 tiles
20 x 28 = 560 tiles required