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The four shaded dates on this page form a square, and their sum is 72. What is the largest of the four dates?

Competition practiceCalendars
  • A18
  • B21
  • C23
  • D22

Step-by-Step Solution

If the top-left date is , the square holds and , with sum , so . The largest is . (18 is the average; 21 is )
Answer: D) 22

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