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Numbers of balls in a frustum

I am unable to solve this question, :confused: helps needed !!

I need to calculate how many balls can be put into the frustum.

Basically i m using frustum of a cone formula to calculate the whole volume.

Frustum Volume = (p * height * (RaČ + Ra * Rb + RbČ) / 3)

= (p * 72 * (81+135+225) / 3 )

= 33250.61665

However for the oval shape item, i do not know how to calculate it. Any idea what formula i should use?

My idea is using the (total frustum volume - oval shape volume) / 1.5 to get the numbers of balls that can be place in the glass. Is my assumption right? I was told the number of balls can be place in is within the range of 3000 to 8000. Please advice.