Floor tiles come in many different sizes.
Floor tiles come in many different sizes.
Floor tiles come in many different sizes.
Floor tiles come in many different sizes.
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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).
85 square feet is the area of a room that measures eight by ten and a half feet. This is the size of a typical second bedroom. If there was a floor tile that measured 12 inches by 12 inches, this would be 85 floor tiles.
If that is 60" tiles it would take 16 total.
The area of each tile is 16*16 sq inches = 1.77... square feet. To cover a 200 square foot square will require 200/1.77... = 112.50 = 113 tiles.
If a bathroom is 72 inches by 54 inches, it would take 27 1 foot square tiles to tile the bathroom. This can be found by converting from inches to feet, then calculating area by multiplying the length by the width.