Depends on the side length of the tiles.
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20.
12X20 = 240 sq feet 12"x12" tiles are 1 sq foot each so must be 240/1= 240
A square with 6" on each side is 1/4 sq ft, so there are 4 tiles in 1 sq ft, and 4 tiles x 8 = 32 tiles.
You will need 140 tiles (10 x 14 = 140)
12 " x 12 " = 1 foot by 1 foot = 1 sq foot. 900 / 1 = 900 tiles are needed (plus waste).