How many 80lb bags of concrete does it take to fill in a 3'x3'x3' hole?

To fill a 3'x3'x3' hole, you first need to calculate the volume, which is 3 feet x 3 feet x 3 feet = 27 cubic feet. An 80 lb bag of concrete typically yields about 0.6 cubic feet when mixed. Therefore, to fill the hole, you would need approximately 45 bags of 80 lb concrete (27 cubic feet ÷ 0.6 cubic feet per bag).