It depends on how high the room is and also the materials used for the walls, floor and ceiling.
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a lot
First you will need to tell us how big is the room. There is a 2x4 at the top and at the bottom, and the vertical 2x4s- called studs- are typically placed on 16 inch centers. Bigger room requires more lumber. Number of doors and windows will also affect lumber needs.
You can not build a wall out of plaster, you need bricks/blocks/stone and cement to build a wall.
I don't think you would need much math to become an actor.
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