Can you spot the mistake in this number puzzle? It's not what you'd expect...

Another puzzle has been doing the rounds on the internet - leaving scores of people flummoxed in its wake.

It was posted online by Facebook user Antley Lamont Staten accompanied by the words: "Ok I don't get it?".

Ok i don't get it? - Antley Lamont Staten | Facebook

Since then it's been shared nearly 400,000 times on Facebook alone, and countless valiant attempts have been made to solve the simple-looking number puzzle.

One user volunteered: "It's 4 and 5. 3+6=9 2+5=7 not 8 and 1+4=5 not 7. That's how I looked at it."

We won't spoil your fun, but suffice to say the answer is not where you think it should be.

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And if you give up, a quick peek at the comments below will provide the answer and soothe your tortured brain.

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