60
It's easy to find 10% Just move the decimal point one place to the left 10%=15. Now multiply that 10% by 4 to get 40% 15%x4 = 60% 40 percent of 150.00 = 60
x4 + 7x2 - 60 = x4 + 12x2 - 5x2 - 60 = x2(x2 + 12) - 5(x2 +12) = (x2 - 5)(x2 +12)
You will need 1.23 cubic yards.
Concrete weighs about 150#'s per cubic foot. Given that your measurements are 2'x2'x4', the block contains about 16 cubic feet. 16 cubic feet of concrete at 150#'s is about 2400#'s per block.
If your talking about 4'x4'x4" thick it will take about 12 bags. Most 60# bags will do .45 cubic feet and that slab would be about 5.3 cubic feet wich equals 11.77 bags.. Mike
60
It's easy to find 10% Just move the decimal point one place to the left 10%=15. Now multiply that 10% by 4 to get 40% 15%x4 = 60% 40 percent of 150.00 = 60
x4 + 7x2 - 60 = x4 + 12x2 - 5x2 - 60 = x2(x2 + 12) - 5(x2 +12) = (x2 - 5)(x2 +12)
6.94 Cubic Yards
17.3 cubic yards will do it.
You will need 1.23 cubic yards.
I would say about 4.
how many yards of concrete will i need to do a 20 x20 x4 slab
You will need 3.1 cubic yards or 139 80lb bags. This assumes a waste of about 5% which is typical.
This area requires 2.5 cubic yards.
This area requires 3.7 cubic yards.