One 9 inch square tile would presumably be 9in x 9in or 81in2, unless you are meaning 3in x 3in tile which is then 9in2. Regardless, the answer to your question is the total area of the floor (in square inches) divided by the total area of one tile (in square inches).
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You would need 25 (5x5).
9 square feet = 1 square yard 1,600 square feet = 1777/9 square yards
If that is 60" tiles it would take 16 total.
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