25ft * 17ft = 425 sq ft = 61200 sq in
So, number of tiles required = 61200/(20*20) = 153
That is as far as mathematics is concerned. It is assumed that each and every bit of offcut is utilised. An assumption that is neither realistic nor likely to resust in a "neat" finish. It is also assumed that there are no breakages. In real life, get 5-10% more tiles - depending on your skill level and the number of tiles in a box or pack.
210 tiles
20ft long by 11ft wide
16 square tiles
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.
I assume you mean an 8ft x 6ft room, which is 48ft2. I assume you mean 12in x 12in tiles, which are 1ft2 tiles. I don't know how many tiles are in a box, but you would need 48 12in x 12in tiles.
144 tiles
210 tiles
There are: 25*19 = 475 square feet
If you mean a 35ft by 25ft room then it is 35*25 = 875 square feet
Depends on the size of the tiles.
12 tiles by 18 tiles or 216 tiles total
20ft long by 11ft wide
120 tiles
16 square tiles
The answer will depend on the size of the tiles!
123 tiles
154