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?
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Answer:
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 30.