SOLUTION: There are 50 students in class. 40 students wear glasses and 30 have dark hair. What is the minimum number of students in class that wear glasses and have dark hair?

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Question 1095097: There are 50 students in class. 40 students wear glasses and 30 have dark hair. What is the minimum number of students in class that wear glasses and have dark hair?
Answer by ikleyn(52787) About Me  (Show Source):
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The minimum number of students in class that wear glasses and have dark hair is 20.

It is the minimal cardinality of the intersection of these two sub-sets.