A maths logic question which will leave you staring blankly at your computer monitor has gone viral.

The mind-boggling question was posted by a Singapore TV presenter to his Facebook page over the weekend and quickly went around the world, baffling readers, The Guardian reported.

Even more infuriatingly, the question was said to be intended for 10-year-old Singapore students.

However, the authors of the puzzle, the Singapore and Asian Schools Math Olympiad, later clarified the question was actually meant for a maths contest involving 14 to 15-year-olds.

"We think it is important to clarify so that Singapore parents will not worry unnecessarily," the organisers said, adding that it was a "difficult question meant to sift out the better students" in the contest.

"We are pleased that this question has generated so much interest and 'solutions' on the Internet."

So, are you smarter than a 14 to 15-year-old Singaporean maths contest champion?



Here is the solution... (hat tip mothership.sg)