Answer: 16
1 sq ft = 12 x 12 sq in
36 sq ft
= 6 x 6 x (3x4) x (3x4) sq in
= (6x3) x (6x3) x 4 x 4 sq in
= (18 x 18) x 4 x 4 sq in = 16 tiles
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Assuming you mean 18 inch by 18 inch, you will need 133 and 1/3 tiles.
You'll need 200 18-inch tiles.
You will need at least 67 tiles. This will cover 150.75 square feet.
You would need 100 tiles - and have some fragments left over.
18 10x10-inch tiles.