Length of the room = 24 feet = 8 yard

Width of the room = 18 feet = 6 yard

Height of the room = 9 feet = 3 yard

Therefore, square yards of wall paper = 3(8) + 3(6) + 3(8) + 3(6)

Square yards of wall paper = 24 + 18 + 24 + 18 = 84 square yard

Width of the room = 18 feet = 6 yard

Height of the room = 9 feet = 3 yard

Therefore, square yards of wall paper = 3(8) + 3(6) + 3(8) + 3(6)

Square yards of wall paper = 24 + 18 + 24 + 18 = 84 square yard