# A Problem From Singapore's Schools

Duchess64
Science 14 Apr '15 19:42
1. 14 Apr '15 19:421 edit
Here's a recreational mathematics problem that recently 'went viral':

"Can you solve the maths question for Singapore schoolkids that went viral?"
--Alex Bellos (13 April 2015)
(The problem was given to the better 14-15 year old students in Singapore.)

I solved it through a straightforward logical process-of-elimination.
(My father gave me more complex logical problems when I was younger.)
Have fun trying it before looking up a solution on the internet.
2. forkedknight
Defend the Universe
14 Apr '15 21:301 edit
Originally posted by Duchess64
Here's a recreational mathematics problem that recently 'went viral':

"Can you solve the maths question for Singapore schoolkids that went viral?"
--Alex Bellos (13 April 2015)
(The problem was given to t ...[text shortened]... problems when I was younger.)
Have fun trying it before looking up a solution on the internet.
Fairly straightfoward solution:

Albert: "I don't know the date, and I know Bernard doesn't know it either"

Albert knows that the month of the birthday cannot have a day in it that is unique, therefore, no May or June

Bernard: "I didn't know before, but now I do."

This eliminates the 14th as the day, leaving only July 16, August 15, and August 17

Albert: "Then I also know the date"

It must be July 16, since Albert could not have a solution if the day was in August
3. 23 Apr '15 16:07
Originally posted by forkedknight
Fairly straightfoward solution:
In fact, though the details are different, the essence of the solution is very similar to that of the famous smudged face problem.