Billy and the School Play Mishap

Topic: Logic
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When three girls are stuck judging kids for the school play they are faced with difficulties. As they see which people are going to come for callbacks they realize their assistant, Billy, forgot to write some information down. To solve their problem they use the power of logic and math!

Common Core Standards: SMP
Problem #: 
145 (2017-2018)
Problem Difficulty Level: 3 [?]