Four.
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There are 12 different cuboids which are possible.
This question cannot be answered sensibly. A metre cube is a measure of volume, with dimensions [L3]. A kilogram is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that in most cases you cannot convert between measures with different dimensions without additional information. A tiny bit of thinking will make this clear: compare the masses of a cubic metre of air and a cubic metre of lead - the first will be very much smaller than the second.
volume of box=20x1x14 cm cube=280cm cube formula used for volume=length x breadth x height
Six squares make up the surface of a cube.