We'll assume that 12 x 12's units are inches therefore making the tiles exactly one square foot. Assuming these are the correct units you've intended then you'd need exactly 27 tiles to cover 26.5 square feet.
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6' x 9' (54 square feet) = 6 square yards of tiles needed.
240 square tiles are needed
236 18-inch tiles.
Each tile covers 4 square feet. Which means you need 200 tiles to cover 800 square feet, plus spoilage.
616 3x6 inch tiles are needed to cover exactly 77 square feet.