The floor is 100 square feet.
The ceiling is 100 square feet.
Each of the 4 walls is 150 square feet.
The total inside area of the room is (100 + 100 + 150 + 150 + 150 + 150) = 800 square feet for painting,
OR
700 square feet painted and 100 square feet of carpet or tile.
You'll have a few drops of paint left over, since the window(s) should not be painted.
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OK, SO, 18 feet by 20 feet is pretty much 18x20 ft2. so 18 multiplied by 20 is 360,, so there are 360 square feet of 360 ft2. Hope this helps!