Think you’re smarter than a 14 year old? Well here’s a mind twister to challenge that assumption!

It’s the maths question aimed at 14 year olds that has stirred up the internet and sent people slightly bonkers.

Why you ask? Well it’s not quite as straight forward as you’d expect.

Via Kennethjianwen Facebook

Taken from the Singapore and Asean Schools Math Olympiads, the question certainly had people confused on Facebook.

Still not sure of the answer yourself?

According to The Study Room here’s the solution:


First we need to figure out if Albert knows the month or the day. If he knows the day, then there is no chance that Bernard knows the birthday, so it must be that Albert knows the month.

From the first statement, we know that Albert is sure that Bernard doesn’t know the birthday, so May and June should be ruled out (the day 19 only appears in May and the day 18 only appears in June). In other words, if Albert had May or June, then he cannot be sure that Bernard doesn’t know, since Bernard could have had 18 or 19.

Following that statement, Bernard knows that May and June are ruled out.

Then, Bernard is able to know which month it is. So it must be either July 16, August 15 and August 17 (not 14th as then he can’t know).

Since Albert subsequently can also be sure of the date, he must know it’s July. If it’s August, he can’t be sure as there is August 15 and 17.

So the answer is July 16.


Don’t worry, it left us scratching our heads too!

h/t Mashable

Top photo: Bad Teacher movie

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