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The question, as stated cannot be answered. You need to know two dimensions of the bricks to find the area of each brick, convert that area into square feet (if necessary) and then divide 256 by the area of each brick. Bricks are not usually square so it would not be appropriate for me to assume that the bricks are 16" by 16".
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The pyramid depicted on the back of the U.S. one-dollar bill consists of 13 rows of bricks. Each row contains a different number of bricks, with the bottom row having 7 bricks, and the rows above decreasing by one brick as you move up. In total, there are 28 bricks in the pyramid.
The weight capacity of a typical wheelbarrow is around 100-200 kg, depending on its size and construction. A tonne of sand is equivalent to 1000 kg. Therefore, it would take approximately 5-10 wheelbarrows to carry a tonne of sand, assuming each wheelbarrow is filled to its maximum capacity.