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$36$ students took English and Math test. $25$ passed English, and $28$ passed Math. $20$ passed both subjects.

a. How many students failed both subject?
b. How many students passed english only?
c. How many students passed math only?

  • 1
    What does the question has to do with set theory?2011-06-21
  • 0
    This is a job for... [Inclusion-Exclusion Man!](http://en.wikipedia.org/wiki/Inclusion-exclusion_principle)2011-06-21

2 Answers 2