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How many 94 pound bags of portland cement needed for a yard of concrete?
Depending on the use of the concrete, between 5-6 bags.
How many 80 lb bags is needed for a 4 foot by 8 foot by 3 inches thick pad?
80lb bags of what. you need to know the density of material working with.
How many bags of cement sand and gravel to make 1 square yard of concrete?
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.
How many lbs in 80 oz?
80 ounces = 5 pounds
How many 20 kg bags of concrete for 0.2 of a cubic meter?
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.
