You know a 80 lb bag of concrete gives 16 cubic feet or 0.60 cubic yard; so you need 45 bags of 80lb for one cubic yard. The math behind it very simple, to find out the quantity of 80lb bags. As we know that in
Answer to: A new sidewalk will be 6 feet wide, 280 feet long, and filled to a depth of 9 inches(0.75 foot) with concrete. How many cubic yards of...