The Potion Quotient

Team: 
Firebirds
Topic: Probability, Counting & Combinatorics
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How can a wizard and a witch get out of detention without using their magic? They must use Muggle Math to answer how many potions they have to make.

Common Core Standards: S-CP.9
Problem #: 
53 (2018-2019)
Problem Difficulty Level: 2 [?]