FLUIDS: Understanding Buoyancy Question

Hi,

So, I know that if an object if floating, then
density object x Volume of the object x gravity = density of the fluid x volume submerged x gravity

g cancels out, we're left with:

density of the object x volume of the object = density of the fluid x volume submerged

by re-arranging, we get a ratio:
density of the object/density of the fluid = volume submerged/volume of the object

This makes sense to me. Now, if two balls of equal volume are completely submerged in water, BUT...

FLUIDS: Understanding Buoyancy Question