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The external length, breadth and heig...

The external length, breadth and height of a closed rectangular wooden box are `18 c m ,\ 10 c m\ a n d\ 6c m` respectively and thickness of wood is `1/2c mdot` When the box is empty, it weighs `15 kg` and when filled with sand it weighs `100\ kgdot` Find the weight of one cubic `c m` of wood and cubic `c m` of sand.

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