Out of 100 persons 50 drink Pepsi, 40 drink coke and 20 drink both Pepsi and coke. The number of persons who neither take Pepsi nor coke is?
Answer: 30
Explanation
Total people = 100
Pepsi drinkers = 50
Coke drinkers = 40
Both = 20
People drinking Pepsi or Coke = Pepsi + Coke - Both
= 50 + 40 - 20
= 70
People drinking neither = Total - People drinking Pepsi or Coke
= 100 - 70
= 30
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