One quart of paint nominally covers about 100 square feet.
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That would depend on the type of paint you want to use. Usually, the area coverage will be written on the label of the paint can. Approx. 400 sq feet is the coverage on a smooth surface using regular house paint, however, an elastomeric paint would only go approx 80 sq ft per gallon.
You will need 100 of them, but they are rectangles, not squares.
Well 1 sq yard of much will cover 325 square ft or so. That is if you have the mulch 1" High. Its recommended to be 1"-1.5" But your probably not going to get it exact at 1" High of mulch so id go with 300 sq ft.
20 ft
yes, for smooth surface you can get 300-400 sq ft per gallon, so two gallons will allow 2 coats