What is the origin of the 'Cheryl problem'?

Cheryl's Birthday Logic Puzzle

Interactive Video
•
Mathematics
•
7th - 12th Grade
•
Hard

Olivia Brooks
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
It is a puzzle from a popular book.
It is a famous riddle from a movie.
It is a competition math problem from Singapore.
It is a viral internet meme.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Who are the three characters involved in the problem?
Alice, Bernard, and Charlie
Cheryl, Albert, and Bernard
Alice, Bob, and Charlie
Cheryl, Bob, and Albert
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What information does Cheryl give to Albert and Bernard?
Albert gets the day, Bernard gets the month.
Albert gets the month, Bernard gets the day.
Both get the month.
Both get the day.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why does Albert say he knows Bernard doesn't know Cheryl's birthday?
Because Albert knows the exact date.
Because the month Albert knows doesn't have a unique date.
Because Bernard told him.
Because Cheryl told him both the month and the day.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which months are eliminated based on Albert's statement?
May and August
June and July
May and June
July and August
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does Bernard deduce after Albert's statement?
He knows the exact date.
He knows the month is either July or August.
He knows the month is May.
He knows the month is June.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which date does Bernard realize must be Cheryl's birthday?
July 16
August 15
July 15
August 17
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