For a 9' x 20' by 4" slab you will need 2.22 cubic yards.
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To calculate the number of 6-inch blocks one bag of cement can lay, we first need to determine the volume of one bag of cement. A standard bag of cement typically weighs 94 pounds and has a volume of approximately 1 cubic foot. Assuming the blocks are standard 6-inch concrete blocks (with dimensions of 8 inches by 8 inches by 16 inches), one bag of cement can lay approximately 12 blocks. This calculation is based on the assumption that each block requires about 0.83 cubic feet of concrete, and a bag of cement can yield roughly 1.2 cubic feet of concrete when mixed with water and aggregates.
Oh, dude, 12.25 rounded to the nearest hundredths is 12.25. Yeah, I know, mind-blowing stuff. Like, it's already there, man. No need to go changing things up.
65 man-hours
13.0
It depends on what you are going to round it to. To the nearest 10, it rounds up to 530. To the nearest 100, it rounds down to 500.