People with a high intellect and the ability to solve problems quickly are very rare, but they still exist. However, For this question that appeared on Facebook, mental agility was not enough and that is why it went viral on social networks.
The mathematical problem faced by students in Singapore to advance through the grade
In Singapore, the teachers of a school have taken their work and the issue of education and school training very seriously. So much so that one of the problems that they have to solve arose on social networks 14-year-old students to be able to pass the grade.
On first reading, it looks very simple and quick to fix. However, the mental, logical and analytical capacity that must be had must be very sharp to be able to try to solve it. The problem is the following.
Albert and Bernard have just made friends with Cheryl and want to know when her birthday is. She gives them a list with 10 possible dates.
“May 15, May 16, May 19, June 17, June 18, July 14, July 16, August 14, August 15 and August 17.”
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After this, Cheryl tells the day and month to each of her new friends, but separately.
Albert: “I don’t know when Cheryl’s birthday is, but I know Bernard doesn’t know either.”
Bernard: “At first I didn’t know when Cheryl’s birthday was, but now I know.”
Albert: “Then I also know when his birthday is.”
The math problem has gone viral on social media, specifically on Facebook, and has been shared around 30,000 times.