Question

HELP IMMEDIATELY!! SOS!! WILL DROWN AND DIE IF NOT RESCUED BY A OPENSTUDY SAILOR!! MEDAL(from user) AND FAN(from becoming famous for rescuing the user) IF HELPED!


This involves quite a bit of knowledge on Venn Diagrams.

Mr. Green teaches band, choir, and math. This year, he has 57 students that take at least one of his classes. 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?