'Fiendish' riddle can only be solved by 5 percent of people - but it's much easier than you think

A seemingly-simple brainteaser is leaving Brits stumped, but can you solve it?

Challenging like this one aren't just a great way to pass the time, they're also a form of mental exercise that has been proven to have a positive impact on our attention span and concentration levels. However, they may also lead to family arguments or tantrums if you don't end up getting the answer right.

Only five percent of people being able to solve this 'fiendish' , despite the fact that it's actually pretty easy. You'll still need a sharp mind and meticulous attention to detail to be successful, though. So, let's get cracking...

"Everyday, the number of lily pads in a pond doubles," the riddle above reads. If the pond is completely full by the 30th day, on which day was it half full?"

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You're not racing against the clock on this one, so take your time and make sure you carefully read the riddle more than once. And sorry, but you're not getting any clues or words of advice! Reckon you've cracked it, or admitting defeat already? Scroll down to the bottom of the article to reveal the answer.

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If you solved the riddle without breaking a sweat, you clearly need a bigger challenge. Below are five seemingly-easy questions all designed to trip you up - meaning you'll need an unflappable personality and sharp mind to get full marks.

Created by quiz master Mahan Lankarani, who has a whopping 1.5 million followers on TikTok alone, it's important to not get too cocky when writing down your answers - otherwise you're destined to make mistakes. Once you've done, you can .

How many pairs of animals did Moses take on the Ark?

You're in a race and pass the person in 3rd place. So, what place are you in now?

John's father had three sons: Snap, Crackle, and...?

If a plan crashes right in between France and Spain. Where do you bury the survivors?

If it takes seven people seven minutes to eat seven burgers, how long will it take 30 people to eat 30 burgers?

ANSWER: The 29th day. This is because the pond is half-full the day before it's completely full (On the 30th day). Still up for another mental workout? Check out these here - or learn more about the hidden parts of your personality by trying a .

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