Density of concrete varies, but those dimensions would yield 31.3 cubic feet of concrete at an average 133 lbs per cubit foot - making 4,100 lbs (or around 2 tons).
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you probably be between 25-30 KG
A 4x8 is about 25 pounds - and very fragile.
U.S. nickels weigh 5 grams each and contain 25% nickel with 75% copper.
Canadian pennies weigh 2.35 grams each. Since there are 100 pennies in one dollar, 25 dollars would consist of 2,500 pennies. Therefore, the total weight of 25 dollars in Canadian pennies is 2,500 pennies × 2.35 grams/penny = 5,875 grams, or approximately 5.88 kilograms.
We'll have to do a lot of patchwork to turn this into a question thateven has an answer:If you want to build a gigantic rectangular block that sits on 24 square feetof land and stands 25 feet high, then the volume of the block is(24 x 25) / 27 = 222/9 cubic yards.That's how much concrete you have to pour, once you get the forms built.