If by 12 X 12 you are referring to inches, that would be one square foot. If you are referring to feet, that would be 144 square feet.
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12 inches by 12 inches = 1 square foot
The best way to figure out how many 13x13 tile will be needed to cover 30 sf of floor is to calculate 13x13/144 give coverage per tile (1.1736), then take 30/1.736 = 25.56 tiles.
Well 12" X 12" would be ONE square foot wouldn't it? so if each tile is ONE square foot how many would be in 142 SQ FEET? sounds like the old who is buried in Grant's Tomb? there would be 142 one square foot tiles in 142 square feet.
If the tiles are 12 inches x 12 inches then they measure 1 square foot. So, you would need 35 of them to cover an area of 35 square feet.
You have failed to tell us the thickness. I have seen these in many thicknesses from 3/16 right up to 7/16.