1 decimeter = 10 centimeters. So one face of a decimeter cube will have [10 x 10] centimeter cubes, so 100 on each face.
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The intersection of two or more solids can either be an empty set, a point (two cones "intersecting" apex-to-apex), a line (two cubes touching along one edge), a face (two cubes, face-to-face). If the solids are "filled", the overlapping intersection will be another solid. If they are hollow, it will be a closed three dimensional figure.
I think the answer is 18 becausea cube has 6 face and 3 cubes have 18 faces.
This is kind of neat. I drew a three dimensional cube. Then divided the faces into 16 squares per face. Then started counting which of those little cubes would have a painted face. I get: 1 red face - 24 cubes 2 red faces - 24 cubes 3 red faces - 8 cubes 4, 5, & 6 red faces - 0 cubes
Assuming they are joined full face to full face, the surface area is between 16 and 18 times the area of one face.
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