Cell Phones and Sibling Rivalry

Team: 
Gummi Pi
Topic: Proportional Reasoning
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Tina Wayne loves pulling pranks on people; especially her mom. This time, it's cash business. Can her two sisters help mom to find out the truth and bust---I mean deal with---the little troublemaker?

Common Core Standards: 7.RP.2
Problem #: 
246 (2011-2012)
Problem Difficulty Level: 4 [?]