There is insufficient information to answer this. 27 centimeters by what?
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2,290 square cm
6 x 4.5cm is 27cm.
The mass of the will depend on the density of the material the the cube is made of. If you know the density of the material in g/cm^3 you can multiply it by the volume of a cube that is 3 cm on each side (27cm^3) to find the mass.
no.of cubes made=volume of cuboid/volume of cube i.e, (21*27*8)/(3*3*3) = 4536/27 = 168 cubes
length x width = area