# Questions tagged [real]

For puzzles that presented themselves, with real parameters and consequences, during otherwise non-puzzling activities.

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### Which duplo digit is 6 or 9?

Not every question has to be as hard as possible, here is an easy one. I joined my kids playing with duplo, and found out that the duplo 9 and 6 look exactly the same if you turn one of them 180 ...
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### Was Exhibit 5 of the Chaocipher ever solved, and if so who solved it and when?

Was Exhibit 5 of the Chaocipher (published c.1991) ever solved, and if so, who solved it and when? Chaocipher is a cipher that was created by J.F. Byrne in 1918 as a machine-based cryptography system,...
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### How can this be?

I was driving on the highway and saw a car with the following sign: "Caution: blind driver". I checked and the sign was describing true events. How can this be possible?
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### What did I photograph?

What did I capture in these photos and how did it happen? This is straight from my camera without any edits or filters. Hint 1: Hint 2: Hint 3:
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### Colouring a rug

I have a rectangular rug in my living room composed of coloured patches (shown below). For convenience I have labelled each distinct colour from 1 to 6. Let's suppose that it was created by starting ...
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### Waffleing my Egg

This morning I had a waffle and a fried egg for breakfast. The fried egg was cooked with a mold, so it was perfectly round and three inches in diameter. The waffle was a 3-inch by 4-inch grid of one ...
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### Is this duplo train track under too much tension?

My kids were making this train track of duplo the other day, and this is what they put together. They are still very young, and for them, this is something big. They were really proud that they ...
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### What food am I making?

I was planning to make two portions, but didn't have enough potable water. Then I decided to make four portions, and the water was plentiful. What food was I making? Hint 1: Hint 2:
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### Martin's magic teapot

Martin really likes tea. In fact he likes it so much that he made his own magic teapot. The first time he pours from it he gets black tea, the second time he pours milk, and finally he pours tea with ...
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### Lifting 5 bricks with one hand

There are 5 identical standard bricks lying on the table. Your hand is large enough to wrap around one brick only. How can you lift all 5 bricks at once with just one hand? You cannot use any other ...
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### A strange construction of locks

This gate is locked with 6 locks. What is the purpose of this construction?
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### Boxeslayers to the rescue

This is about layering boxes, not about slaying them. We have 1,830 2×5 boxes to stack safely as 10 alternating contiguous layer patterns of 183 boxes each. Layers have identical silhouettes that fit ...
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### Football winners without scoring [closed]

A football (soccer) team didn't score any goals, yet they still won the game. How is this possible?
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### The case of a piece that could go missing

What piece of hardware was after all unnecessary? And how? These diagrams, though somewhat schematic, are meant to directly represent everything pertinent. Nothing has been omitted or added to ...
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### Reconstructing the Candidates Tournament 2018

The Candidates Tournament 2018 was an eight-player double round-robin chess tournament, which was held in Berlin, Germany, between 10–28 March 2018. The winner, Fabiano Caruana, earned the right to ...
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### Beware of raining cephalopods

The picture depicts a real traffic sign painted in South Africa. It was intended to be an official traffic sign - but the painter, being unfamiliar with them, painted this according to the brief he ...
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### How can you drive back without refueling? [closed]

My husband and I set out for a day trip towards a tourist town 20km away from our location. We only have enough fuel to reach the town, but my husband assured me that we will easily drive back to our ...
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### The "Loop of rope" dilemma

It's a "dilemma" that I encountered in real life problems. I believe that it's not new and is quite easy to explain, but may look puzzling at first glance. Alice and Bob are playing with a ...
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### What are these two athletes talking about?

Fernando Alonso and Esteban Ocon are currently the two drivers driving for Alpine Racing Team in the 2021 Formula 1 season. Earlier today, Fernando and Esteban had this conversation in clearly coded ...
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### Simple puzzle, but that's not the point - what's the significance of the spacing of the shelves?

We had a cabinet that used to contain CDs. We liked the cabinet but had to admit that we hadn't taken them out for years. We decided to put some shelves in the middle (the outer ones will have hanging ...
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### Reconstructing sport climbing results

Sport climbing at the 2020 Summer Olympics – Women's combined Warmup Sport climbing is a new event (one of four) at the 2020 Summer Olympics in Tokyo, and it just finished. Two events were held, one ...
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### Largest rectangle from 20 Lego bricks

You have twenty 2x4 Lego bricks, like the one shown below What is the area of the largest rectangle you can make satisfying the following conditions: All bricks must be connected in a single ...
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### Where is this coat of arms from? [closed]

My father found an old glass during a recent move and has no idea where it's from. It looks vaguely familiar to me (maybe all coats of arms look vaguely familiar), but I've looked up the places we're ...
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### Discounts in a shop

I came across this sign in a shop and thought it could make a nice puzzle. So you can buy items and get discounts depending on how many items you got. You can combine discounts and use as many as you ...
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### Cracking prices

I recently went to a furniture store where people spend my annual salary on a garish commodes and ostentatious vitrines. I note a curious code at the bottom of each item’s description label. Some ...
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### Riding on non-circular wheels

The mathematician Stan Wagon built a tricycle with square wheels that can ride smoothly on a carefully crafted curved surface: Now I have some puzzles for you: Is there a surface that allows one to ...
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1 vote
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### Reverse Engineer Chess Software Calculations

TLDR Just the Puzzle Given a number n and a weight w the function f will result in a weighted number r as follows. f(n, w) = r n can be a number from 0 to 200 w can be a number from -100 to 100 (...
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### The Greenhouse Problem

While I was playing a certain popular indie farming game, I came across a dilemma. I have a greenhouse that I'd like to fill as efficiently as possible. How many plants can I fit in the greenhouse? ...
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### A real-life puzzle. I'm mystified

I am not sure that this (or anywhere) is the right place to ask. I'm just puzzled about some things that happened today. Genuinely happened - this is not a set-up for an ordinary puzzle. This morning ...
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### Rack 'Em Up! 🎱

In a game of English eight-ball pool, a set of 15 balls are arranged or 'racked' in the shape of an equilateral triangle. In order for the balls to be racked fairly, they must be arranged like so: <...
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### Explain these dirty tire tracks

The image below shows a clean Jeep and dirty tire tracks on a black paved parking lot. The tracks are dirtiest near the Jeep, less dirty at the bottom of the image, and even less dirty on the right ...
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### Why did the number of islands change?

There is a cluster of islands, which a private pilot flies over at dawn. The pilot can see 17 islands. A week later, she makes the same flight, at dawn, following the same altitude, speed, path and ...
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### Explain this holiday calendar oddity

Happy Boxing Day! Yesterday was Christmas Day, and in a few days, it will be New Year's Day. Each holiday season, those two holidays are always on the same day of the week (in this case, Friday). But ...
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### Explain this bad parking job

One bright Monday morning, I drove to work and parked my car in Lot A. That morning, others also parked in Lot A, and we all found each other’s parking jobs to be satisfactory. That afternoon, a co-...
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### Another Zodiac Killer Puzzle

This is a multi-part puzzle concerning the Zodiac Killer "Pines" card sent to the San Francisco Chronicle on March 22, 1971. I will ask it as a series of questions and hints, as I think it's ...
806 views

### Reconstructing World Cup results

In the group stage of the World Cup, teams compete within eight groups of four teams each. Each group plays a round-robin tournament, in which each team plays three matches, one against each other ...
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### Starred, as to the crew's aid

The flavour text (except for the puzzle's name) is not a hint, but a true story I didn't really have any ideas for a puzzle, but my everyday life gave me one. I think, the puzzle could be better if I ...
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### Explain this pattern of water spots in a parking space

Today, I found this pattern of water spots in a parking space. Other parking spaces with cars in them also had similar patterns of water spots. What caused this pattern, and why are there more water ...
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### Aliens Attack Apartments?

Difficulty level: fair to middling Pose level: too tempting to resist When attempting to fill in a bureaucratic blank, a friend serendipitously snapped this cameraphone picture . . . . . . ...
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### Optimal refueling strategy

On the way home from work, I want to refuel my car. There are 5 petrol stations along the way that all have a different price for petrol. I know that the prices will be in the range [A, B], chosen ...
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1 vote
200 views

### Travelling out of the country

Where did Kate go? Below is a fictitious conversation: ...
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### Can you produce a wolf's template? Part 2

Here is the first question. You are given a square piece of paper with no marks on it. With this paper, you have to make a wolf's template. You are given no tools such as a ruler or scissors, and all ...
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### The key with no door

I was given this key, along with an attached seating assignment, at a wedding reception. While many guests assumed it was merely a decorative key, a few clever guests quickly realized the truth. The ...
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### Drawing a perfect circle without any tools [closed]

You are given a pen and a large piece of paper. Without using any additional tools (eg., ruler, compass, string etc) how can you draw a perfect circle?
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### Calculate total score from average score

A class of students have taken $8$ exams. The average scores of the exams are: 1st: $80.12$ 2nd: $74.59$ 3rd: $77.83$ 4th: $77.34$ 5th: $82.07$ 6th: $81.25$ 7th: $78.90$ 8th: $75.44$ What is the total ...
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### Why is the pavement wet?

Saw this the other day. So I took this picture. There was another nearly identical wet patch 2 spaces away. Why is the pavement wet? Note: This is a straight forward physics puzzle. This is a ...
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### Someone Shoot Me!

Real-life situation, this time. I was at work the other day and had just done something. I needed to tell a coworker he needed to do it as well, but he was on the phone at the time. Not wanting to ...
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### Buying weight plates for a home gym, what is the fewest number I need

I'm buying a home gym set-up for my son (really!) and I want to know the fewest number of weight plates I need to buy to be able to go up in 5kg increments to 170kg. The bar weighs 20kg and the ...