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In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like either tea or coffee?

In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like either tea or coffee? Correct Answer 60

Given, a + b + c + d = 100, a + c = 40, b + c = 30, c = 10 b+10=30 => b=20 a + b + c = 40+20 = 60 i.e. 60 persons like either tea or coffee.

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