Density of substance

1. Apr 13, 2015

PhysicStud01

1. The problem statement, all variables and given/known data

2. Relevant equations
Density = mass / volume

3. The attempt at a solution
the correct ans given is B.
Mass is constant. I calculated the volumes of each (the cube of the separation), found the difference in density and then divide the difference by the initial density. but the answer i obtained was 0.31, which is not even given here.
i verified my answer many times but there don't seem to be an error

2. Apr 13, 2015

ehild

You need the factor between the final density and the initial density,

3. Apr 13, 2015

andrevdh

Please show how you got to 0.31

4. Apr 13, 2015

PhysicStud01

thanks. now i got the answer.

it was much easier than i thought