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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 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.
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.
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%
according to my books you will need at least 50 bags of 60lbs of cement maybe more but less than 80 bags
@ 1:5 mix, 15 cement and 71 25kg bags of sand (1,175kgs)
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.