They say only geniuses can solve this puzzle, and this time they are correct.

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## MindYourDecisions

•## 7 months ago

This is now the most watched video on YouTube featuring the Lambert W function, and also introducing many people to Knuth's up-arrow notation. And yet the math meanies never praise or share my videos! Math negativity is a huge reason why so many people dislike studying math…(more details below)

People often send me puzzles they see on social media. They love these videos because learning how to solve them helps builds their confidence in math. The few negative comments must come from people who don't actually watch the videos–nearly everyone who watches them praises them very highly (100+ million views, Shorty Award nominee, praise from famous mathematicians, citations in books/papers/courses, frequent media mentions, positive reviews to my many books, etc.). Take it from me: don't listen to the confidence crushers/math meanies/dream destroyers! Everyone agrees negativity is hurting math education, so we need to be extra positive to cancel them out!

## Devin Smith

•## 7 months ago

Im going to watch this video to see why its not the obvious answer of 22.

## Jonathan Ryals

•## 7 months ago

I am SMRT. If ballons can equal numbers they can equal question marks. The answer is "??".

## Lugeja

•## 7 months ago

If a single blue balloon = 1.56 them how 2 green – 2 blue balloons = 2?

## Dinindu Udakara

•## 7 months ago

21

## MitreX

•## 7 months ago

In my opinion based on visual interpretation + exemple 1 where answear is 21, you can have 2 other results : 31 and 11 . based on green's baloons arrow

## Adg Sewf

•## 7 months ago

you missed a point, IF length of arrow matters or not.

of coz longer arrow mean heavier too, but the balloon raise higher than shorter one, they have exact same volume, so the gas mixture in each ballon is different

## Emmanuel Ross

•## 7 months ago

It's 21 which is approximately equal to 21.56. 🤦🏻♂️

## Ralph Macey

•## 7 months ago

After all the balloons I was hoping there'd be cake and ice cream.

## Gia Hưng Acoustic Fever

•## 7 months ago

If:Red+Red+Red=30

Red+Green+Green=18

Green-Blue=2

Then:Blue+Red*Green=(42)

## methanbreather

•## 7 months ago

real genius: find the easy pattern in a messy looking pile of information.

so the real genius will answer 21.

Wannabe genius on the other hand…

## M Biswas

•## 7 months ago

Answer is =21, as red=10, green=2 and blue=1

## Kryton X

•## 7 months ago

Thank God I learn about business and not engineering😂

## Vitus Brummer

•## 7 months ago

Have you seen that the arrows below the green balloons aren't the same size but the arrow below the blue balloons are🙈

## michaelwillard777

•## 7 months ago

I’ve never heard of that kind of math, my answer was and still is 21.

## Rafael Matavelli

•## 7 months ago

POWER TOWER!

## Mohammad Alsabbagh

•## 7 months ago

Didn’t you notice that the green balloons have different length in their arrows? We can consider the short arrow of green balloon=1 while the tall one = 3 , so the final result will be 31 . Seriously, that makes sense 😂

## Game play videos

•## 7 months ago

I got 21 is that the right answer?

## briar patch

•## 7 months ago

13

## Debashish Dutta

•## 7 months ago

This was gross over complication of a simple puzzle. We were not exactly trying to ensure the absolute accurate amount of rocket fuel to be filled in a rocket before its launch where a very very high degree of accuracy is indeed required.. In most real life situations none would bother about 21.56 and 21. This is not material at all. After all the technical application what you got was 21.56 and the ordinary mortals like me got 21 in less than 2 minutes. Sorry but not impressed with this sort of intellectual masturbation.

## Bennett Rogers

•## 7 months ago

No… it’s brown… red and blue make purple mixed with green make brown… so there!

## kodi Gowtham Ghambhir

•## 7 months ago

I got the answer as 21

## fgee3

•## 7 months ago

Following the operation rules it is 21, doing the operations from left to right it is 22. And with higher mathematics it is "something inbetween"? C'mon!

## Mirza Baig

•## 7 months ago

My only issue is since both the balloons are exactly the same. They should represent the same number. Not X & Y

## superblitz

•## 7 months ago

Basic answer

Standard calc: 22

Scientific calc: 21

## Torsten Breswald

•## 7 months ago

what about the different length of the arrows at the green balloons???

## joao santos

•## 7 months ago

48 48 48 48

## stephen b

•## 7 months ago

I got 1+10×2.66=27.66.

## Andy Owens

•## 7 months ago

Knuth, tetration and W functions?! I thought I'd done some fairly advanced maths in my time, but I've never heard of those. I'll stick with linear equations.

## Fred Hall

•## 7 months ago

Sorry, but 22 is the answer and I got it in 20 seconds. Your figures took you how long..? Time is money man…and you would be fired!

.

.

## Richie Ingpiece

•## 7 months ago

I got 21! I thought I'd done something clever….how mistaken I was….

## Richie Ingpiece

•## 7 months ago

I think the simple interpretation is the correct one…the puzzle requires you to provide an exact solution, not an approximate one….

## 34_Vince Teo

•## 7 months ago

Answer is 21. ez

## ExIm Asia

•## 7 months ago

You're over thinking it. These kinds of puzzles are meant to test innate intelligence and reasoning ability as apposed to one's educational level in mathematics.

## Vivian Paul

•## 7 months ago

3:21 when u get correct answer in examination but u over think and u get different answer😂😂

## Stefan Ambrose

•## 7 months ago

I am confusion why do it so hard

## Stefan Ambrose

•## 7 months ago

21

## Sean Tratervel

•## 7 months ago

To make things more complicated, in morse code, a dash (a long arrow) is T, two dashes (two long arrows) are M, a dash and a dot ( a long arrow and a short arrow) are N. Combine this with Lambert W function and Knuth's up-arrow notation, you will get the answer of …… brain blows up