How to do problem no. 9 from Math Counts School Handbook 2011 2012

Team: 
The Lifes
Topic: Solid Geometry
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This video shows you how to do problem no. 9 from Math Counts School Handbook 2011 2012 in a very easy and understandable way.

Common Core Standards: 6.EE.9
Problem #: 
9 (2011-2012)
Problem Difficulty Level: 3 [?]