Brainteaser is so difficult people are convinced there's no right answer - can you solve it?

A ridiculously difficult brainteaser that went viral on Reddit has left swathes of users moaning there is no right answer. But one person claims they've managed to solve it

Brits have been left scratching their heads at an 'impossible' brainteaser that hardly anyone can solve.

Puzzles and riddles are a great way to occupy the kids for a couple of minutes when they inevitably refuse to go out and play in the miserable winter weather. Researchers have also found they can actually positively impact the central nervous system, leading to improved cognitive functions including better concentration levels.

However, to solve this baffling brainteaser - which went viral on Reddit - you'll need to have some razor sharp analytical skills and be able to think outside the box. So, let's get started...

What is the toughest brainteaser you know of?
byu/DarthRiven inAskReddit

"A teacher has an advance maths class containing seven students," the riddle reads. "Every class for the whole year ends with the teacher putting a random number from 1-7 on their heads (they can have the same number as someone else in the class, everyone could get a five for example).

"The students are allowed to look at each others numbers, but not communicate. They then have to guess what number is on their head. As long as at least one student guesses correctly every class, they will be taken out for pizza at the end of the year. All the students love pizza, especially well earned pizza, so what strategy can they employ to guarantee they get it? Their guess is to be written down, and the teacher takes it from their desk."

Stumped? You're not the only one...

Want to avoid the doom and gloom? Get the latest positive news sent straight to your inbox with our Bright Stuff Newsletter

Flocking to the comments section, swathes of users express their frustration - arguing the brainteaser could never be solved. "I don't understand how this is possible, the numbers are independent from each other and no communication is allowed," one person fumed. "So looking at the other students' numbers wouldn't give you any information on your number."

Another agreed, pointing out: "If they're not allowed to communicate, how would everyone decide on this strategy?" while a third joked: "They cheat?"

However, user Ace Magi say they had a big breakthrough on how to solve the puzzle. "It's given in the problem that everyone can see everyone else's number but not their own," he states. "We number these students from 1-7. These are the steps each student must perform to, and if done, one student will be correct. As an example, I will take the role of one of the students, lets' be student number 3.

"I add up all the numbers of every other student - lets say the sum is 30. I subtract the sum(30), from my own personal number(3) - we get -27. I add as many 7's as I can until I get a number between 1-7: -27 + 4*7 = 1. 1 is the number I write down on my paper. IF THE REMAINDER IS 0, I WRITE DOWN 7."

Do you have a story to share? Email us at yourmirror@mirror.co.uk for a chance to be featured