That is 90 square feet and that should require 90 12in tiles.
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You can't answer how many tile you need since the size of the tile wasn't provided in the question. You will need 100 square feet of tile to cover the area and 10 square feet extra for cuts, breaks, and mistakes. Buy 110 square feet of tile.
176 tiles
You would need 111 tile, but with waste you will want to get 125 tile.
3/10 of a tile
12 x 13 or 156 tiles.