25.5
Or more if you do not want to have a bunch of small pieces of tile covering some of the area. the number depends on the shape (dimensions) of the 30 sqft area.
If the area is 5' by 6' than you will need 30 tiles if you want as few pieces as possible (but you will have to cut 11 of them).
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20" = 2.78 square feet. Now divide the area of the tiles into the area of the room. 140/2.78 = 51 tiles
100 tiles or 96 which is the correct amount
You will need at least 66,828 1/4 tiles to cover that area.
Assuming you mean 16x16 inches tiles... 441 tiles would cover the area exactly
You would need 29 tiles of that size to cover that area (28.77 tiles) to be precise,