article_snippet.sent: Albert and Bernard just became friends with Cheryl, and Albert and Bernard want to know when her birthday is.
article_snippet.sent: Cheryl gives Albert and Bernard a list of 10 possible dates.
article_snippet.sent: Cheryl then tells Albert and Bernard separately the month and the day of her birthday respectively.
article_snippet.sent: At first the question appears impossible to answer without a bit of extra information, but we know Cheryl has already told Albert the month of her birthday, and Bernard the day.
article_snippet.sent: Bernard only knows the number of Cheryl’s birthday, but from Albert’s statement Bernard has now also ruled out both May and June.
article_snippet.sent: If Cheryl had told Bernard that Cheryl birthday fell on the 14th of the month, then Bernard could not have worked out the date at this stage.
article_snippet.sent: Following Bernard's statement, Albert is then apparently able to deduce the date of Cheryl's birthday.