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It depends on what the cube is made out of.
aprox 21.04 tons
5.4
It depends on the density of the sand, between about 1.4 tons dry, 1.7 tons rammed, dry. Wet sand will be heavier.
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.