In a survey of 100 people, 60 drank tea, 50 drank coffee, and 30 drank both. How many drank neither?
A$10$
B$20$
C$30$
D$40$
Answer & Solution
Correct answer: B. $20$
Union (tea or coffee) = 60 + 50 − 30 = 80. Neither = total − union = 100 − 80 = 20.
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