If that is 60" tiles it would take 16 total.
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You would need 25 (5x5).
9 square feet = 1 square yard 1,600 square feet = 1777/9 square yards
The floor's area is: 1,296 square feet.
18-ft x 20-ft = 360 square ft1 square yard = 9 square ft360 square ft = (360/9) = 40 square yards
The area of the floor is 1296 square feet.