Assuming the bricks are 4 inches wide and 16 inches long. Then the area of one brick is 64 square inches = 64/144 = 4/9 square feet, hence to cover 640 square feet we need (640)/(4/9) = (640x9)/4 = 160x 9 = 1440
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If the bricks are in feet then 51/2 bricks would be needed.
88 standard sized bricks.
Depends on how big the bricks are
900 of them.
About 14 bricks should do it.