225 bricks.
16in * 16in = 256 sq. in.
20ft = 240in.
240in * 240 in = 57,600 sq. in.
57,600 sq. in. / 256 sq. in. = 225.
225 bricks is your answer.
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you would need 12...
You would need 20 pavers 20 times which is 20x20=400.
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...
64
Assuming the 12x12 bricks are 12 feet on each side, those are 144 square feet. The patio itself is 76 square feet. Unless you made a typo, not even one of those bricks is going to fit on the patio; you end up with about 0.5278 bricks.