The Raccoon's Chase

Team: 
The Raccoons
Topic: Probability, Counting & Combinatorics
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A raccoon scares two little children who arrive at a doorkeeper's door. They solve a math problem to get through, but they have another nasty little encounter with the raccoon.

Common Core Standards: SMP
Problem #: 
45 (2012-2013)
Problem Difficulty Level: 3 [?]