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Gee, a square foot is 12x12, difficult problem.
Technically, 2.6388888888888 etc. but 3. I'm assuming the brick is 12x12 feet here as that is the only unit you have mentioned...
A 12 x 12 inch brick is 1 square foot. A 20 x 20 (foot) patio is 400 square feet, so you would need 400 bricks.. this assumes you are butting the bricks fairly tight, not leaving large seperations between them, etc...
Each brick has an area of 1ft x 1ft ie 1 sq foot. So you would need 308 bricks.
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