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If a surface is 144 square feet = 20,736 sq inches, you need at least (172,8 rounded to) 173 tiles (6 by 20 inches) to cover it.

Each tile is 6 inch*20inch= 120 sq inch. 20,736 sq inch / 120 sq inch = 172,8.

Depending on the shape of the surface you may need more if you have to cut some tiles to make them fit.

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