Puzzle Brain teaser everyone has failed so far

A brain-busting maths challenge puzzling some of the internet's greatest minds was first set as a test for third graders in Vietnam.

The head scratcher involves filling in the gaps with the digits 1 to 9 and the solution can be found using basic maths, according to VN Express.

Third graders aged 8, in the town of Bao Loc in the Vietnamese highlands, were reportedly set the challenge in class.

“This problem is difficult even for adults good at math, so it will be difficult for students in grades 3, and even more challenging for students in the highlands,” teacher Tran Phuong told VN Express.

He added: “I sent the problem for some people, including a doctorate in economics with mathematics, but they have not given the answer.”

So there you have it. Eight years olds can do it.


Here is one clue: The strange : symbol represents the division sign.