In a party of 150 persons, 75 persons take tea, 60 persons take coffee and 50 persons take milk. 15 of them take both tea and coffee, but no one taking milk takes tea. If each person in the party takes at least one drink, then what is the number of persons taking milk only ?
30
Calculation:
Assume, the number of people who drink only milk is x.
According to the question,
60 + 15 + (x - 5) + (50 - x) + x = 150
120 + x = 150
x = 150 - 120 = 30
∴ The desired value is 30.
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