Depends on what depth you want to spread the gravel at.
This answer depends on knowing the cubic capacity of 50 lbs. of gravel.
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13 1/4
You'll need about 28.704 cubic yards (37 tons) of gravel.
Plan on about 2.2 cubic yards (2.8 tons) of gravel.
You will need about 463 cubic yards (around 594 tons) of gravel for this area.
3000 sq ft * 4 inches = 1000 cubic feet.