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 neither tea nor coffee?

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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 neither tea nor coffee?<br /><img src='https://www.fatskills.com/class11maths/mathematics-questions-answers-venn-diagrams-q5.png' alt='mathematics-questions-answers-venn-diagrams-q5' width='388' height='236' />