Density is directly related to the mass and the volume. In fact, it tells us of the exact relationship between the two. To find an object's density, we take its mass and divide it by its volume. If the mass has a large volume, but a small mass it would be said to have a low density.
A is x times larger than B 4*10^-3=x times larger than 4*10^-4 4*10^-3=x*4*10^-4 divide both sides by 4 10^-3=x*10^-4 divide both sides by 10^-4 10^1=x 10^1=10 answer is 10 times or C
