How to do problem no. 58 from Math Counts School Handbook 2011 2012

Team: 
The Lifes
Topic: Algebraic Expressions & Equations
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This video shows you How to do problem no. 58 from Math Counts School Handbook 2011 2012 in a very easy and understandable.

Common Core Standards: 8.EE.7
Problem #: 
58 (2011-2012)
Problem Difficulty Level: 4 [?]