Convert everything to cubic feet. It should be easy then. Since one yard = 3 feet, 1 cubic yard = 27 cubic feet; also, one square foot x 1/4 foot = 1/4 cubic foot.
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5inches
It depends on the thickness and the density. One ton should be about 15 cubic feet when compacted, so it would cover 30 square feet 6 inches thick or 45.
22.2222 cubic yards (the 2s keep on going).
36 tonnes
8.25 cubic yards of concrete