As a 18 sq ft room has area equal to 18*144=2592 sq inches, you need 2592/(18*18)=8 18 inch tiles.
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i cant give you an answer with out know how big the tiles are sorry :(
157 18 by 18 tiles are needed to cover 352 square feet.
168
You would need a total of 36 tiles to cover that area.
If the floor tiles are measured in inches and the room is measured in feet then the tiles are 1sq feet and the room is 6x8 = 48 sq feet so you would need 48 tiles.