Is this a Question???????
(If this is important then sorry for my answer)
216/8= 27. X= 27. Subtract you divide
The volume of the first figure: 904.78 m^3
the volume of the second figure: 113.1 m^3
Difference: 904.78-113.1= 791.68
126 inches
(Ask me if you have any questions :) )