Density has dimensions of (mass) divided by (volume) = M L-3
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The volume of a rectangular solid with those dimensions is 27 cm3.If we also knew its mass, then we could calculate its density.
Marshmallows vary in density. They are not a pure substance. As they contain air bubbles their density can be altered merely by squeezing them as can their volume but their mass would be the same even if smashed into pieces. The marshmallow's physical dimensions would change.
The answer depends on what information you have been provided with. If you have only the linear dimensions then it is: Length * Breadth * Height * Density.
Density = mass/volume Mass = (density) x (volume) Volume = mass/density
Density = mass/volumeMass = (density) x (volume)Volume = mass/density