Euclid Middle School: Band, Orchestra, & Chorus

Oak Ridge Mathinators
Topic: Problem Solving (Misc.)
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At Euclid Middle School there are 33 students in the chorus, 45 students in the band and 21 students in the orchestra. Fifteen students are in both the band and chorus, 9 are in both orchestra and chorus, 4 are in the band and orchestra and 2 students are in all three. How many students are in the orchestra only? The Oak Ridge Mathinators solve this problem in two different ways.

Common Core Standards: S.CP.1
Problem #: 
107 (2011-2012)
Problem Difficulty Level: 4 [?]