Posted by Jonathan Lim on 12 April 2015
PHOTO: Here’s a supposedly P5 logic question going viral on Facebook that will melt your brain
Posted by Jonathan Lim on 12 April 2015
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqMVK7Bogj40Lw3NDaYhGdBWdrsr_-QSh4A4NO9tfABNUZUacSvFXcE9YcCxu1fBJjZdgm6JN2B-zTKHsXGrGIvFa4Q1m7w3LEKt1XasAPSsnlclEv-jlQQolpkd17kBeNJFlJ-N8_fm0/s1600/trick-question.jpg
http://cdn.mothership.sg/wp-content/uploads/2015/04/trick-question.jpg
http://mothership.sg/2015/04/heres-a-supposedly-p5-logic-question-going-viral-on-facebook-that-will-melt-your-brain/
It is not known whether this is really a Primary 5 question or if it came from Singapore, but more importantly, can you solve the question?
Answer:
Table posted by Stephanie Ng Wan Jing
Texts (explanations) posted by Jun Cai
PHOTO: P5 logic question
Posted by Jonathan Lim on 12 April 2015
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqMVK7Bogj40Lw3NDaYhGdBWdrsr_-QSh4A4NO9tfABNUZUacSvFXcE9YcCxu1fBJjZdgm6JN2B-zTKHsXGrGIvFa4Q1m7w3LEKt1XasAPSsnlclEv-jlQQolpkd17kBeNJFlJ-N8_fm0/s1600/trick-question.jpg
http://cdn.mothership.sg/wp-content/uploads/2015/04/trick-question.jpg
http://mothership.sg/2015/04/heres-a-supposedly-p5-logic-question-going-viral-on-facebook-that-will-melt-your-brain/
July 16 is the only possible answer
1) Albert: I don't know when Cheryl's birthday is, but l know that Bernard does not know too.
A knows B confirm don't know the date, which means A wasn't told May or June because May and June both have an unique identifier (5/19 and 6/18) ie. If B was told 19 or 18 the entire Condition 1 is wrong.
We are left with July to August. B is now confident of his answer, so his Date must be unique, thus eliminating 7/14 and 8/14.
A says he now knows the answer, because July is the only unique (There are two August dates, left)
Reference
- https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqMVK7Bogj40Lw3NDaYhGdBWdrsr_-QSh4A4NO9tfABNUZUacSvFXcE9YcCxu1fBJjZdgm6JN2B-zTKHsXGrGIvFa4Q1m7w3LEKt1XasAPSsnlclEv-jlQQolpkd17kBeNJFlJ-N8_fm0/s1600/trick-question.jpg
- http://cdn.mothership.sg/wp-content/uploads/2015/04/trick-question.jpg
- http://mothership.sg/2015/04/heres-a-supposedly-p5-logic-question-going-viral-on-facebook-that-will-melt-your-brain/