For this, you can work out the volume of the cylinder of sand you need to fill. But you'll also need to know the density of the sand to convert this volume into weight.
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22/7x6x6x6 cubic inches
about 432 cubic inches
.21 yards of sand will fill an area 115 inches by 67 inches to a depth of 2.5 inches.
6,400 ft3
259.2593 sq. yards.