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It depends on the units of your measurements in. You also need to know the weight of a bag of cement. The instructions on the bag of cement should also help.

Q: How many bags of cement will you need for an area of 2.5 x 5.11 x 4?

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Bags of what? Grass seeds? Cement? Sugar?

How much does a bag of cement weight? Know that and you have a very simple formula: y = 4000/x where x is how much a bag weights and y is your answer.

It will say on the bag how much area it will seed. You need to know the area of the ground you are seeding.

9.72 Cubic Yards of Concrete is required, if you are going to order by cement truck. 874.8 bags of 40# (40 lbs) bags, or 583.2 bags of 60# 437.4 bags of 80#

How much cement is needed to cover 192 square feet of area

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Bags of what? Grass seeds? Cement? Sugar?

You will need about 7 25kg bags of cement.

100

If a 20kg bag of cement=0.1m3 with 100 lots o 0.01 to 1m3 then you will need 12.5 bags per m3. So you need approx 11.5m3 of sand and 144 bags of cement (144 x 0.01 = 1.44m3) to give you a total of 12.94m3

It depends on the usage of the concrete. For footings, you would need 5 bags of cement. For sidewalks, etc. you would need 6 bags. Generally, if you know the usage it's for, you can contact a local ready-mix plant and they can tell you exactly.

6 x 4.32 = 25.92 so you will need 26 bags. You might want to get up to 10 % extra for waste.

1 50kg bag fill about 2 cubic f. so for 102cu.f. you'll need 51 bags

you would need 23 bags OK

Need to know how many bags of cement I will need for a 20x10 space?

You will need 5.5 40kg bags for this floor. This allows for a typical waste factor of 5%

You need to know the size of lawn, and the grass seed bags will tell you how much area they cover.

according to my books you will need at least 50 bags of 60lbs of cement maybe more but less than 80 bags