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a 50 pound bag of gravel will cover approximately 2 to 3 square feet of area to a thickness of 3 to 4 inches.
Depends on what depth you want to spread the gravel at. This answer depends on knowing the cubic capacity of 50 lbs. of gravel.
You need (8 x (520/1000)) lbs ie 4.16 lbs so you only need 1 bag but won't use much more than half of the contents.
To answer this question you will need to know the size trowel you need and also the number of pounds in a bag. A 50 lb bag using a 1/4" x 1/4" square notch trowel, you are going to expect about 80 - 90 sq ft. The back of the bag should give you the break down for other sizes.