Questions tagged [no-computers]

A puzzle designed to be solved without using calculators, online decoders, or computer programming. Using a computer to type and post the answer is allowed; the spirit of this tag is to make people solve the puzzle on their own.

Filter by
Sorted by
Tagged with
31
votes
4answers
3k views

Breaking the record

There is a record whose value is expressed by a natural number. (The value is strictly discrete, not only continuous and then rounded to a natural number.) However, after the record is once ...
3
votes
2answers
1k views

The Pirates and the Mangoes [duplicate]

A group of hardy pirates are sailing along when they encounter the Royal Navy of Lord Richard. The battle is long and vicious. Sadly, the pirate ship is sunk. The only survivors are five of the crew ...
5
votes
3answers
257 views

French alphametic (corrected)

This is the corrected version of puzzle French alphametic (misspelled) Every letter stands for a digit in base-10 representation, different letters stand for different digits, and the four ...
8
votes
2answers
454 views

Alphametic as protest #2

Riddles for all. Since my latest alphametic as protest got a good feedback but my riddle as protest did not, I decided to stick to what works and added a new alphametic as a protest for the riddle ...
12
votes
2answers
1k views

Alphabetical Sudoku

Who loves fish? Okay that might sound a bit weird but don't worry, I am still sane. Maybe. To answer the question you must complete the Sudoku below. A word will appear in the highlighted box which ...
0
votes
4answers
556 views

Two opposite onramps one city [closed]

Is it possible to have two freeway on-ramps,(one going north and one going south), and have them both go to the same city?
8
votes
3answers
612 views

Gambling with the leading digit of $2^n$

Your gambling friend has come to stay with you and offers to play a game with you as many times as you wish: He chooses an integer $x$ between $1$ and $9$ inclusive, and makes a wager of $\$1$ with ...
15
votes
3answers
1k views

For which numbers does the order of reversing their digits and squaring not matter?

This was a question made up by a friend who doesn't have SE. Let the function $r:\mathbb Z^+ \rightarrow \mathbb Z^+$ reverse the digits of a number (in base 10) that it is applied to. In addition, ...
18
votes
2answers
2k views

Someone has vandalised this long division. Can you reconstruct it?

Oh dear, someone has vandalised this long division. They've replaced every digit either with a wrong digit or a hyphen. Your task: reconstruct the entire thing. There's no remainder. Please show ...
18
votes
1answer
439 views

2 Knights tied together in a dangerous maze

2 knight pieces of the game chess were trying to find their way to freedom, while being tied together with a small rope. It was so small that it forced them to be placed in adjacent squares at all ...
8
votes
5answers
1k views

A few word puzzles 1

Here are some short word puzzles. 1) What's a not uncommon 7 letter word containing all 5 vowels and "s" and one other consonant (not necessarily in order)? 2) What's a common one syllable word, ...
6
votes
4answers
401 views

How do you transport 42 cars?

You're a soldier in the dictator's army. The dictator is very impressed with your incredible abilities. He asks you this question: There are 42 cars in this parking lot over there. How do you ...
5
votes
2answers
428 views

Ternary FTW! Or not

One day, I wanted to be able to represent all numbers less than 20 without erasers or computers (Don't ask, OK?) I immediately thought of making cards1. For example, in base 10, you need 2 for the ...
14
votes
9answers
4k views

Perfect Squares!

A question was asked in a mental ability test yesterday. Write four distinct numbers with these properties: 1. Sum of each pair is a perfect square. 2. Sum of all four is also a perfect ...
6
votes
4answers
3k views

Are perfect cubes possible?

Based on this. Can you find 4 distinct integers a, b, c, and d such that a+b, b+c, c+d, a+b+c, b+c+d and a+b+c+d are all perfect cubes? If not, prove it.
7
votes
2answers
755 views

Last contact in custody

You came so close. The job was going so well. You just never expected that the police would have a surveillance cat. That's what you get for trying to steal things in an age where people are strapping ...
6
votes
2answers
239 views

Square-root of CAREER alphametic

Every letter stands for a digit in base-10 representation, different letters stand for different digits, and leading digits are always non-zero. $\sqrt{CAREER} \,\, = \,\, RUT $ Which digit does ...
7
votes
2answers
789 views

Password Cracking

You are trying to crack someone's password. You don't have any password cracking software, nor do you have time to get any. From sources unknown, you know that: A. The password is alphanumeric (only ...
11
votes
6answers
2k views

Coke alphametic

The only thing I love more than Coke is numbers divisible by 73. I claim I have found a unique assignment of distinct digits $0,1,...,9$ to the symbols $ C, O, L,$ and $A$ such that $73$ divides the ...
5
votes
2answers
464 views

Numbers = letters 2.0

SIX + SEVEN + SEVEN = TWENTY This is a standard alphametic, no hidden rules. (An alphametic is a puzzle in which every letter corresponds to exactly one number, ...
-12
votes
1answer
583 views

Social networking “party” system

A party is a group chat, the only difference being there's a "leader" (this is the person who started the chat) In these parties, there can only be 5 maximum users, this includes the leader. In ...
3
votes
1answer
182 views

An alphametic for Nikolai Gogol

"Diary of a Madman" (Russian: Записки сумасшедшего, Zapiski sumasshedshevo) is a short story by Nikolai Gogol. MAD * MAN = ASYLUM Which digit does each ...
4
votes
2answers
278 views

Alphametic between Kennedy and Nixon

Every letter stands for a digit in base-10 representation, different letters stand for different digits, and leading digits are always non-zero. ...
12
votes
1answer
240 views

An alphametic for René Descartes

The best known philosophical statement by René Descartes is "Cogito ergo sum" (French: Je pense, donc je suis; English: I think, therefore I am). ...
1
vote
3answers
338 views

Alice and Bob Alphametic

Let me tell you a story about Alice and Bob. When they are together it's all fun and games, we know that. But what happens when they are not together? I'll tell you. Alice has an odd feeling. It might ...
4
votes
4answers
568 views

Tick-a-tick Tick-tick

Charlie has two clocks that hold reasonably good time. That is, each clock ticks at a constant rate, but its ticks are not necessarily exactly 1 second apart. The period between ticks is constant for ...
5
votes
1answer
934 views

Not MONEY but GIFT alphametic

There is a well-known alphametic story where a poor college student sends a telegram with the words "SEND MORE MONEY" to his parents, asking for more money, and asking to fill in each letter with a ...
6
votes
1answer
183 views

Alphametic twins

Every letter (in left and right summation) stands for a digit in base-10 representation, different letters stand for different digits, and leading digits are always non-zero. ...
3
votes
2answers
123 views

A condemning alphametic

Every question mark and every letter stands for a base-10 digit Different letters stand for different digits Question marks are placeholders and stand for arbitrary digits (such digits also may occur ...
12
votes
1answer
4k views

Two dead beans on a stone

Samuel Bean, a Canadian doctor, had a tombstone erected in Rushes Cemetery near Crosshill, Wellesley Township, Ontario, for his first two wives, Henrietta and Susanna. The original stone was carved in ...
4
votes
1answer
163 views

Bad grammar alphametic

Every question mark and every letter stands for a base-10 digit Different letters stand for different digits Question marks are placeholders and stand for arbitrary digits (such digits also may occur ...
14
votes
6answers
1k views

A set of lockers

There is a series of 100 lockers in a school. All of them start closed. Students number 1 to 100 flip an even, two sided coin. If the coin lands on heads, they go through each locker corresponding ...
10
votes
2answers
951 views

An ugly formula [closed]

Our teacher wrote the following ugly algebraic formula on the blackboard $$(n+\sqrt{n^2-1})^{4/3}+(n+\sqrt{n^2-1})^{-4/3}$$ Our teacher told us that for some positive integers $n$ this ugly formula ...
7
votes
1answer
228 views

Subtraction square dance alphametic

Every letter stands for a digit in base-10 representation, different letters stand for different digits, and leading digits are always non-zero. ...
10
votes
4answers
2k views

A sloppy calculation

Little Johnny Red forgot to write the multiplication sign between two 3-digit numbers $x$ and $y$ and simply wrote them as one number. When Johnny's teacher graded the homework, it turned out that the ...
11
votes
1answer
435 views

Watch the video and figure out who stole the documents?

Ms. Shipra is a renowned scientist in TIFR, Mumbai. She recently discovered a new way of gaining huge energy from the water-current at a much lower cost. Considering its future application, many ...
4
votes
2answers
200 views

Square dance alphametic

Every letter stands for a digit in base-10 representation, different letters stand for different digits, and leading digits are always non-zero. ...
8
votes
2answers
204 views

Nebulosity alphametic

Every letter stands for a digit in decimal representation, different letters stand for different digits: ...
9
votes
1answer
332 views

Not the “SEND MORE MONEY” alphametic

There is a story that a poor college student sent a telegram with the words "SEND MORE MONEY" to his parents, asking for more money, and asking to fill in each letter with a different digit in order ...
3
votes
3answers
585 views

Ten types of stamps

The country Dalgonia issues stamps of only ten different denominations: $134$, $135$, $136$, $137$, $138$, $139$, $140$, $141$, $142$, and $143$ cents. What is the largest amount of cents which ...
9
votes
2answers
214 views

An almost Shakespearian alphametic

Every letter stands for a digit in base-9 representation, different letters stand for different digits, and leading digits are always non-zero. ...
11
votes
3answers
698 views

Three positive integers

Find the smallest possible value of $ab+c$, where $a,b,c$ are positive integers with $a+bc=2016$. (No computers! The puzzle has a nice direct solution.)
7
votes
3answers
235 views

Multiplicative alphametic: This is too hard

Every letter and every question mark stands for a digit in base-10 representation Different letters stand for different digits Question marks are placeholders and stand for arbitrary digits (that ...
7
votes
3answers
979 views

A bad and boring riddle, and an easy alphametic

First comes the bad and boring riddle (the answer is to be written in all capital letters): Magnesium plus Gallium yields a joke. Next comes the easy alphametic: Solve the answer to the bad ...
8
votes
1answer
158 views

A very different Alfred E. Neuman alphametic

Yesterday I posed an Alfred E. Neuman alphametic with multiplication, and today I pose an Alfred E. Neuman alphametic with division for the lovers of Mad magazine: Every letter and every question ...
3
votes
1answer
148 views

Anakin, Obi-Wan and Dooku are a match for Sidious!

Darth Sidious is too powerful. Anakin and Obi-Wan discusses and convinces Count Dooku (Darth Tyrannus) to fight against his own master. It is the only way they can be a true match against the Dark ...
7
votes
3answers
355 views

Flock of Geese alphametic

In each of the following three alphametic puzzles, every letter stands for a digit in base-10 representation, and different letters stand for different digits. Leading digits are always non-zero. <...
6
votes
1answer
201 views

Alfred E. Neuman alphametic

Every letter and every question mark stands for a digit in base-9 representation. Different letters stand for different digits. Leading digits are always non-zero. An alphametic for the lovers of ...
9
votes
7answers
725 views

Recover book titles and suggest more books

I am working on a series of book-trivia puzzles. Given an excerpt from the book directly mentioning the book title, players are asked to fill in the title. Example Given the excerpt ...now we ...
6
votes
3answers
2k views

Baseball games alphametic

Every letter a decimal digit, different letters for different digits: BASE + BALL -------- GAMES Which digit does each letter represent?