Cheryl S Birthday Math Problem
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July 14 july 16.
Cheryl s birthday math problem. It is an interesting problem and might be asked in the interviews. At first i don t know when cheryl s birthday is but now i know. Bernard has been told the day of cheryl s birthday. May 15 may 16 may 19.
If he knows the full date he must have been told 15 16. This means that cheryl s birthday cannot be may 19th or june 18th as if it was then bernard would know the answer. Albert and bernard just became friends with cheryl and they want to know when her birthday is. At this point it is imperative that we don t forget the basic elements of this problem.
That being said albert prior to solving the problem altogether also knows that cheryl s birthday must be july 16 th august 15th or august 17 th. Bernard has deduced that albert has either august or july. Keep in mind that albert just like bernard can deduce everything that we have. It is based on logical deduction.
It went viral in a matter of days. There are only two days 18 and 19 that appear once on cheryl s list. The dates range from 14 to 19 among the 10 that are given with only 18 and 19 occurring once. August 14 august 15 august 17.
The question was posed as part of the singapore and asian schools math olympiad sasmo in 2015 and was first posted online by singapore television presenter kenneth kong. More links stuff in full description below extra footage for this video. Cheryl gives them a list of 10 possible dates. The puzzling problem went viral after singapore television host kenneth kong posted it to facebook.
June 17 june 18. I don t know when cheryl s birthday is but i know that bernard does not know too. The solution involves using logic to deduce the dates which can t possibly be cheryl s birthday. Cheryl s birthday is a logic puzzle specifically a knowledge puzzle.
So from albert s statement bernard now also knows that cheryl s birthday is not in may or june eliminating half of the possibilities leaving july 14 july 16 aug. Cheryl s birthday challenge was meant to test the better high school students competing in the.
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