Depending on the use of the concrete, between 5-6 bags.
80lb bags of what. you need to know the density of material working with.
Figure about 1/2 cubic foot per 60 lb bag. The basic formula is to use equal amounts of cement, sand, and gravel. There are 27 cubic yards per cubic foot. It depends upon how thick you are planning to pour the concrete. For one foot thick, you would need 9 cubic feet of concrete. For 6" thick, you would need 4 1/2 cubic feet. I'll give you the answers for 1 ft thick and for 6" thick. For 1 foot thick, you need 9 cubic feet at 1/2 cubic foot per 60 lb bag equals 18-60 lb bags. That's six 60 lb bags of concrete, plus six 60 lb bags of sand, plus 360 lbs of gravel. For 6 inches thick, divide each of these by 2 to give 3-60 lb bags of concrete, 3-60 lb bags of sand, plus 180 lbs of gravel.
80 ounces = 5 pounds
To fill 0.2 cubic meters, you will need about 21.6 bags. According to the site at the related link, a 20 kg or 40 lb bag of premixed concrete should fill an area of 1/3 cubic foot, which is 1/106th of a cubic meter. There is also a separate estimate of 108 20-kg bags per cubic meter, which provides essentially the same result.
9.33 bags. Concrete mix is usually is 60 or 80 lb bags, so check the labels.
About 56
There is 0.45 cubic feet in a 60-lb bag, so you need 60 bags. If you go to 80-lb bags, there's 0.60 cubic feet and you need 45 bags.
This all depends on the mix you want. I assume you mean cement when you mention the 80lb bag of concrete. I have pushed concrete in my day... Bag cement mix is the same as concrete. Don't be funny. How many 80 pound bags will make 1 yard of concrete? I want a definitive answer this time.
10 bags. Each 80 lb bag is 0.6 cubic feet, and your hole is 6 cubic feet.
About 56
P.S.- how did you find this out? Do you weigh 80 lb. bags of cement for fun? rofl ^_^
10 80# bags will fill about 6 cubic feet, so 375 bags should fill 225 cubic feet (30 x 30 x 0.25).ANS 2 -At least in my area, it would be much cheaper ordering this to be delivered by a concrete truck.An 80 lb. bag of concrete is 2/3 of a cubic ft. of concrete. 3 bags is 2 cu. ft. So for 225 cu.ft. youll need 338 bags of concrete.
Depending on the use of the concrete, between 5-6 bags.
40 bags of 90 will give you 1 yard
Forty five (80 lb) bags
About 40. 1cuyd=27cuft.. 27cuft/(0.675cuft/90#bag) = 40 bags