18-ft x 18-ft = 324 square feet
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18 ft * 16 ft = 288 sq feet
As a 18 sq ft room has area equal to 18*144=2592 sq inches, you need 2592/(18*18)=8 18 inch tiles.
12*18 sq ft = 216 sq ft
To convert square feet to square yards, you divide by 9. So, to find the number of square yards in an 18 ft x 14 ft area, you would first find the area in square feet (18 ft x 14 ft = 252 sq ft) and then divide by 9 (252 sq ft / 9 = 28 sq yds). So, there are 28 square yards in an 18 ft x 14 ft area.
9 sq ft = 1 sq yard so 28 ft * 18 ft = 28*18 sq ft = 56*9 sq ft = 56 sq yards.