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All 70 guests at a Lucknow wedding drank tea, coffee or both. The note gives each total. How many guests drank both?

Competition practiceVenn Diagrams
  • A90
  • B18
  • C20
  • D14

Step-by-Step Solution

Tea + coffee , which counts the both-group twice, so both . 90 is the sum of the totals, 18 is coffee only , and 14 is just .
Answer: C) 20

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