I have to guess at a lot, because you did not give enough information. Is this 11 feet x 11 feet x 1 foot? That is what I will assume. Sand has a density of about 2.7.
So: 11 x 11 x 1 x 62.4 x 2.7 /50 = 407.7216 bags so about 408 bags
bags of what?
That would depend on the density of the bags of topsoil.
I don’t know
One pound is 16 ounces, so you can fill 2 8-ounce bags from each pound of mix. With 10 pounds of trail mix, you can fill 20 8-oz bags. Well, 19, since you're probably eating trail mix while you're filling the bags, and you'll have eaten one bag's worth while you worked.
20 bags. 16 oz are in a pound. 10 X 16 = 160 160/8 = 20
One pound is 16 ounces, so you can fill 2 8-ounce bags from each pound of mix. With 10 pounds of trail mix, you can fill 20 8-oz bags. Well, 19, since you're probably eating trail mix while you're filling the bags, and you'll have eaten one bag's worth while you worked.
One cubic yard is equivalent to 27 cubic feet. A 60-pound bag of Quikrete typically yields about 0.45 cubic feet of concrete. Therefore, to fill one cubic yard, you would need approximately 60 bags of 60-pound Quikrete bags (27 cubic feet ÷ 0.45 cubic feet per bag = 60 bags).
1 50kg bag fill about 2 cubic f. so for 102cu.f. you'll need 51 bags
To fill a 30-gallon drum with concrete, you would need approximately 12 bags of 80-pound concrete. This is based on the fact that one 80-pound bag of concrete yields about 0.6 cubic feet, and a 30-gallon drum holds about 4 cubic feet. Therefore, dividing 4 cubic feet by 0.6 cubic feet per bag gives you roughly 6.67 bags, but accounting for the weight and settling, it's safer to estimate around 12 bags.
10 bags. Each 80 lb bag is 0.6 cubic feet, and your hole is 6 cubic feet.
air
To determine how many bags of concrete you need to fill a five-gallon bucket, first calculate the volume of the bucket. A five-gallon bucket holds about 0.67 cubic feet. If you're using a standard 60-pound bag of concrete, which typically yields about 0.45 cubic feet, you would need approximately 1.5 bags to fill the bucket. Always check the specific yield of the concrete mix you are using for the most accurate calculation.