some formulae:

volume of a cube:

x * y * z


volume of a cone:

1/3 * Pi * r^2 * (vertical)h

frustrum of a cone:


1/3 * Pi * r(total)^2 * (vertical)h - 1/3 * Pi * r(top)^2 * (top)h


volume of a cylinder:

Pi* r^2 * height


volume of sphere:

4/3 * Pi * r^3


If this is any help at all please don't post your results directly on here as someone else may like to try the puzzle - you will know when you have the answer - just post 'I've got it' or something.