A Toss of a Coin

Team: 
CH!LY
Topic: Algebraic Expressions & Equations
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When it is a bad, stormy day with terrible lighting, this trio decides to play a game. Toss the coin, score 11 or 16 points. But what happens when one of the members go to the bathroom? Will he be able to find out the mystery number? Find out in "A Toss of a Coin"

Common Core Standards: SMP
Problem #: 
171 (2012-2013)
Problem Difficulty Level: 3 [?]