In a flight 50 people speak Hindi, 20 speak English and 10 speak both English and Hindi. The number of people who speak at least one of the two languages is:
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You can verify this with a Venn Diagram. Place 10 in the intersection. Then Hindi-only speakers are \( 50 - 10 = 40 \), and English-only speakers are \( 20 - 10 = 10 \). Total: \( 40 + 10 + 10 = 60 \).