Math
posted by Unknown .
Mr. Green teaches band, choir, and math. This year, he has 57 students that take at least one of his classes. He teaches band to 25 students. There are 48 students who take either band or choir or both. There are 9 students who take both math and choir with Mr. Green. Use the Venn diagram below:
a. How many students take exactly 2 classes from Mr.Green?
Venn Diagram: There are 11 in the Band section
17 in the Choir section
7 in the Band AND Math section
And 3 in the Math, Band, AND Choir section
I'm have been stuck on this question and it's really stressing me out a bit, I just need some hints.

Math 
Reiny
Having the same problem using ONLY the top part data.
Is the information in the Venn diagram given or did you somehow calculate those ?
Why you say, "17 in the band section" , does that mean 17 ONLY in the band section ?
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