It depends on the size of the boxes. If the boxes are one square foot, then you need 1400 of them. This obviously differs with box size.
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150
approximately 3.5 feet
(40 feet)(28 feet) = 1120 square feet.
12 and 14
(21.5) x (21.5) = 462.25 -- It has 462.25 square feet on the floor. -- It has another 462.25 square feet on the ceiling. -- It has (21.5 times the height of the room) square feet on each of the four walls.