Skip to main content
235 votes

Correct way to add 22 to 4 to get 82

So we have the 'sum': $$22+$$ $$4\;=$$ $$82\;\;\;$$
JMP's user avatar
  • 35.6k
185 votes
Accepted

Correct way to add 22 to 4 to get 82

In French:
Dr. Wharfe's user avatar
  • 1,446
161 votes

Correct way to add 22 to 4 to get 82

My suggestion:
kamenf's user avatar
  • 6,506
124 votes

Is this Hashi puzzle unsolvable?

Here is another argument for why this puzzle is unsolvable. The Handshaking Lemma is the simple but powerful idea that each edge uses up a value of 2 (one from each end), so the total amount must be a ...
Jaap Scherphuis's user avatar
113 votes
Accepted

How can I convince my colour blind friend that his two balls have different colours?

b a's user avatar
  • 1,852
104 votes

Correct way to add 22 to 4 to get 82

And thank goodness we don't use those any more.
Ergwun's user avatar
  • 2,780
93 votes
Accepted

Is a married person looking at an unmarried person?

Answer is because,
Smart's user avatar
  • 4,492
88 votes

Quick!!! You got only 30 seconds

No real-world car can accelerate faster than $5g$, so the maximum acceleration of the car is under $50m/s^2$. Even if the car instantly decelerates (against a wall or something), the fact that $P$ can ...
Anon's user avatar
  • 2,684
84 votes
Accepted

Thanks, dad! Never again

I think that the next number will be Because you are watching The numbers are called out by Addendum
hexomino's user avatar
  • 136k
83 votes
Accepted

3 doors, three guards, one stone

No questions are required!
StephenTG's user avatar
  • 3,615
71 votes

IQ test question with diagonal lines in 3x1 grids

As far as I can tell, the answer is Because:
marcelm's user avatar
  • 791
71 votes
Accepted

Guessing hat colors. 4 prisoners

This is a bit of a stretch and I'm not sure it'd even work, but...
HugoBDesigner's user avatar
68 votes
Accepted

Can you put L trominos to fill the figure?

Answer: Reasoning:
Magma's user avatar
  • 5,259
67 votes
Accepted

The Cucumber Paradox

I'm gonna say: Explanation:
votbear's user avatar
  • 4,637
67 votes
Accepted

Cover 63 squares of a chess board

These should do it: Just to show another example:
hdsdv's user avatar
  • 5,190
66 votes

How can I convince my colour blind friend that his two balls have different colours?

You can for example photograph the balls in two separate photos and use a program Color Picker (like this one) showing your friend that the RGB color codes are different.
Stefano Lonati's user avatar
66 votes
Accepted

Unexpectedly Difficult Matchstick Problem

I think the answer is:
Sid's user avatar
  • 15.2k
65 votes
Accepted

This is it. This is the one. Find your wife

This is a comprehensive and complete round up of the answers submitted and will credit the people who solved it. Clues from the flight schedule (thanks to seasnake, MPeti and Dan Russell): And:
65 votes

Crack the lock code

You can see from clue 4 that there are no 7, 3, or 8. You can see from clue 5 that there is a 0 in either the first or second slot, and from clue 3 that it must be in the first slot. That means the ...
Deusovi's user avatar
  • 147k
64 votes
Accepted

Haters gonna hate

The greatest number of students that could be summoned is Proof you cannot summon more: Here is a situation where the principle can summon that many:
Mike Earnest's user avatar
  • 32.4k
63 votes
Accepted

Correct way to add 22 to 4 to get given value

If you consider the numbers as Then
KoA's user avatar
  • 2,440
63 votes
Accepted

100 pieces 1 opportunity, choose wisely!

What you're missing here is the chance of playing at all, given that the game ends when someone finds the prize. (or, chance of finding a prize goes to 0, which is the same thing) ...
Chris Cudmore's user avatar
58 votes

How can I convince my colour blind friend that his two balls have different colours?

Show him the balls through Edit: He might agree that there is some difference that he can't see, but he's still not convinced that it's the colour. Then
user24582's user avatar
  • 581
56 votes
Accepted

Gerrymandering Puzzle - Rig the Election

Jay's user avatar
  • 4,879
55 votes
Accepted

Is this chromatic puzzle always solvable?

Yes, it's possible. Start with the various 2x2 squares. Ignoring symmetries of rotation and color swapping, there are 1 combination of 1 color, 3 combinations of 2 colors, and 2 combinations of 3 ...
user3294068's user avatar
  • 7,498
52 votes
Accepted

Tiling with T-tetrominos in gravity

TLDR: I'll fill the board and prove that the solution is unique. First, let's start by: I'll paint those green: Let's repeat those steps a few more times, using orange, blue, red and purple, in ...
Victor Stafusa - BozoNaCadeia's user avatar
51 votes
Accepted

What color is the drummer's hair?

White is not So White's hair can only be The rest is easy since we know what White hair color is Black's hair color is and Redhead's hair color is
Oray's user avatar
  • 30.3k
50 votes

Gerrymandering Puzzle - Rig the Election

@Jay already found the solution to this, but I wanted to expand a little more on why it's the only solution:
HTM's user avatar
  • 16.3k
49 votes
Accepted

Crack the lock code

The code is: Explanations: One number is correct and is also correctly placed: One number is correct but wrongly placed: Two numbers are correct and wrongly placed: Nothing is correct: One ...
Techidiot's user avatar
  • 18.9k
49 votes
Accepted

Is this Hashi puzzle unsolvable?

There is no solution (see diagram). First, the 8-island must be connected as indicated. Second, the 1-island in the top row must be connected as indicated. Third, the 3-island in the top row must be ...
Will Octagon Gibson's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible