It depends on the coverage of the paint and the porosity of the surface being painted.
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315 ft^2
1000 sq ft should do it
That's going to depend on . . . -- how many square feet 1 gallon of paint covers -- whether you want to paint any of the walls ---- if so, how many, and the height of the ceiling above the floor -- whether you want to paint the ceiling -- whether you want to paint the floor None of these parameters is given in the question. We therefore don't stand a chance.
It is 72 cubic feet.
36 square yards.