one square foot = 12 x 12 = 144 sq inches - 30 x 30 = 900 / 144 = 6.25 sq ft.
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67.5
Guess 30 x 30 tile means a tile 30cm by 30cm i.e. approximately 1 foot by 1 foot, in which case the answer is 1 square foot.
A quarter of one tile (6 ft * 20 ft) will be sufficient!
2.5 feet are in 30 in.
Since a 12" x 12" tile is exactly one square foot, the answer should be obvious.