The way I got it figured is as follows:
The formula for calculating the volume of a sphere is
V = (4/3) * pi * r^3
where r = radius
Seeing that those babies eyeball out at a radius of, oh, let's say 2.78 inches, one can plug said dimension into the formula and confirm that each one surely is 90 cubic inches....... regardless of the true diameter of those spheres, there surely is a lot more than 90 hoe-powa in each one of them motas!!!!!!