Birthday Riddle Has Internet Buzzing
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An riddle posted online by the Singapore and Asian School Math Olympiad has set the internet buzzing with people trying to figure out when Cheryl's birthday is.
Here is the riddle:
Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is.
Cheryl gives them a list of 10 possible 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 and Bernard separately the month and the day of her birthday respectively.
• Albert: I don't know when Cheryl's birthday is, but I know that Bernard does not know too.
• Bernard: At first I don't know when Cheryl's birthday is, but I know now.
• Albert: Then I also know when Cheryl's birthday is.
Q: So when is Cheryl's birthday?
GIVE UP?