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Cheryl’s Birthday

Hardlogic

This Hard puzzle in the “logic” category rewards careful reading and step-by-step reasoning. Use the hint if you are stuck, then compare your approach with the explained answer.

Cheryl tells Albert and Bernard that her birthday is one of these dates:

  • May 15
  • May 16
  • May 19
  • June 17
  • June 18
  • July 14
  • July 16
  • August 14
  • August 15
  • August 17

Cheryl then tells Albert the month and Bernard the day.

Albert says: “I don’t know Cheryl’s birthday, but I know Bernard doesn’t know either.”

Bernard says: “At first I didn’t know, but now I know.”

Albert says: “Then I also know.”

What is Cheryl’s birthday?

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