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242 cubic feet
2800 feet of gravel
Depends on what depth you want to spread the gravel at. This answer depends on knowing the cubic capacity of 50 lbs. of gravel.
"http://wiki.answers.com/Q/How_much_crushed_gravel_for_eighteen_square_feet_by_four_inches_deep" 6 cubic feet. With Gravel weighing 95 pounds per cubic foot, you will need approximatly 570 pounds of gravel Four inches is 1/3foot so 18sq.ft x 1/3ft=6cu.ft. You usually buy gravel by the cubic yard which is 3ftx3ftx3ft=27cu.ft so you only are looking at 2/9 cu.yd18sq.ft is only 4ftx4-1/2ft. so is not much area to cover. Weight varies by type of gravel.
Plan on about 2.2 cubic yards (2.8 tons) of gravel.