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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 only tea?

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 only tea? Correct Answer 30

Given, a + b + c + d = 100, a + c = 40, b + c = 30, c = 10 a+10=40 => a=30 i.e. 30 persons like only tea.

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