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Mathematics

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Caroline recorded the grade level and instrument of everyone in the middle school School of Rock below.
School of Rock
Guitar Bass Drums Keyboard Total
6th grade 15 19 19 15 68
7th Grade 16 15 12 14 57
8th Grade 10 17 12 18 57
Total 41 51 43 47 182

How many students in the School of Rock play keyboard

Answer :

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