Answer
Find out the how many ping pong balls would fit inside the Earth.
To prove
Let us assume that the number of ping pong would fit inside the Earth be x.
As given
A ping pong ball has a volume of approximately 3.4 cm³.
The Earth has a volume of approximately
cm³ .
Than the equation becomes


(approx)
Therefore in
(approx) ping pong balls would fit inside the Earth.