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235 votes

Correct way to add 22 to 4 to get 82

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

Correct way to add 22 to 4 to get 82

In French:
Dr. Wharfe's user avatar
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161 votes

Correct way to add 22 to 4 to get 82

My suggestion:
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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

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

b a's user avatar
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Correct way to add 22 to 4 to get 82

And thank goodness we don't use those any more.
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93 votes

Is a married person looking at an unmarried person?

Answer is because,
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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
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84 votes

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
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83 votes

3 doors, three guards, one stone

No questions are required!
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71 votes

IQ test question with diagonal lines in 3x1 grids

As far as I can tell, the answer is Because:
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71 votes

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

Can you put L trominos to fill the figure?

Answer: Reasoning:
Magma's user avatar
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67 votes

The Cucumber Paradox

I'm gonna say: Explanation:
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67 votes

Cover 63 squares of a chess board

These should do it: Just to show another example:
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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

Unexpectedly Difficult Matchstick Problem

I think the answer is:
Sid's user avatar
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65 votes

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
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64 votes

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
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63 votes

Correct way to add 22 to 4 to get given value

If you consider the numbers as Then
KoA's user avatar
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63 votes

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
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56 votes

Gerrymandering Puzzle - Rig the Election

Jay's user avatar
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55 votes

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
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52 votes

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

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
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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:
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49 votes

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
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49 votes

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

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