Depending on the poly, the wood as well as the condition and the age of the wood, figure a minimum of 300 - 500 square feet per gallon. If the floor is very old or dry, it will be closer to the 300. If the wood is in good condition and reasonably new, 500 is a reasonable assumption. Also, with each coat you put on, the poly will last longer once a foundation coat is established.
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600 sq ft
you will need 5 cans of paint.
1 gallon of paint to cover about 350 square feet You need slightly more than a gallon if the walls are unpainted drywall, which absorbs more of the paint
It depends on the percent of solids. To simplify this, after all the liquid (solvent) part has evaporated, the pigment (solids) is what remains. One gallon of paint having 100% pigment (solids) or no solvent in it, will cover 1600 square feet at 1 mil thickness. If one gallon of paint has 50% pigment (solids) and 50% liquid (solvent), then one gallon of paint would have a net or dry film of 800 square feet.
21.135 gallons