38ft*6ft*1.5inch = 38/3 yards*2yards*1.5/36yards = 1.055... cubic yards.
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55.56 cubic yards.
(33.33)/(the number of cubic feet in each bag)
It depends on how deep the concrete. 600 sq ft at 6 inch deep is 300 cu ft = 11.1 yards. 12 inch deep is 22,2 yards; 4 inch deep is 5.5 yards
around 5 inches
That's not enough information. You need to know the width of the trench, and how much volume 1 ton of gravel is equivalent to.