SOLUTION: there are 18 students in an AP astrophysics class in Cedric Benson high school. 7 students are interested in studying back-body radiation. 13 students are interested in studying hy

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Question 498050: there are 18 students in an AP astrophysics class in Cedric Benson high school. 7 students are interested in studying back-body radiation. 13 students are interested in studying hydrostatic. If there are 3 students not interested in either of those topics, how many are interested in both????????
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
11 notB (18 - 7), but 3 are neither, so 8 are notB but H

5 notH (18 - 13), but 3 are neither, so 2 are notH but B

8 only H, 2 only B, 3 neither ___ leaving 5 for both (18 - 8 - 2 - 3)