they both weigh the same.
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Multiply 4 time 8 to get 32 square inches for each brick, then divide 32 by 144, the area of a square foot, to get 0.22222etc, then divide 175 by the 0.22222 to get 787.5 or 788 bricks if you can only have whole bricks.
500lbs
Yes, the pound has been in use for many centuries as a measure of weight.
You need 1350 4 x 8's If the bricks are really that size, you'll need 1476.42 of them If you're really doing brickwork and not math homework, factor in the mortar and go with the first figure. Add 10% for breakage.
1320 btu`s