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Questions tagged [no-computers]

A puzzle designed to be solved without using calculators, online decoders or computer programming.

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6
votes
3answers
396 views

Lucky Lottery Tickets

Six-digit lottery ticket numbers are considered lucky if the sum of the first three numbers is equal to the last three. Eg. 123204, 871529... Prove that all possible lucky numbers added together is ...
7
votes
2answers
847 views

Triangle with incircle [closed]

This question is from the German mathematics competition Känguru der Mathematik. In this competition students have to solve 30 mathematical tasks like this in 90 minutes without calculator. Actually ...
10
votes
1answer
201 views

Irrationality in the balance

Sensibilly -T ™ scales were out of stock, so Gramazon filled the order with a lousy Lopside® from Irreturnable Irrationals International, Inc.73205080...  How ...
13
votes
3answers
406 views

Gone ortho-flogging

 Well played, Scratchy, you just took 8 shots on Hole 9 of Puzzlington Municipal Ortho-flog Course! As presented As flogged (solved) by you --------------...
8
votes
5answers
778 views

The distance between David and Eric

Alice and Bob are looking at each other, both turn $10$ degrees and now they both can directly see Claire. If they continue turning in their same directions before, Alice will directly able to see ...
11
votes
1answer
1k views

What are these numbers?

A simple (I think) alphametic puzzle $\small{MADMEN = (M+A+D+M+E+N)^{((M+E+N) - (M+A+D))}}$ M,A,D,E,N are different (no repeats) positive integers between 0 and 9 and of course the 2 Ms are the ...
4
votes
7answers
328 views

Sum of three six digit numbers

This puzzle is a variation of a 3 digit addition puzzle I saw recently. A , B , and C are positive integers between 0 and 9. A,B and C are different integers Six digit numbers formed using A,B and ...
4
votes
4answers
2k views

Three words with three animals

Can you give me at least 3 ( I found 4 so far) Five Letter words with at least 3 animal names spelled in them? No anagrams (rearranging letters). The 3 animal names must be in ONE WORD. Find 3 ...
4
votes
6answers
1k views

Tom's mysterious alphanumeric character

Tom: I drew a mysterious alphanumeric character and showed it to Harry. Dick: Harry, was it a letter or a number? Harry: I'm not sure! Dick: Assuming it was a letter, was it uppercase or ...
15
votes
2answers
1k views

What's the missing pattern? 3x3 grid, dot pattern

What is the missing piece to this pattern? Got it as a quiz at work - no one here knows what it is!
3
votes
1answer
569 views

The SUM 50 Game

Attached Grid (Total 5 x 5) has a black box grid (3 x 3) inside it. The Black box grid needs to be filled out with numbers 1 thru 9 using all numbers once. The Outer Red box squares (Total 16 ) need ...
0
votes
1answer
341 views

Which letter completes this puzzle?

As shown in picture below, which letter completes the puzzle ? It bogging me for few days already ...
5
votes
2answers
242 views

Can this be undone to make a knotless loop?

Can this be undone to make a knotless loop?
1
vote
2answers
438 views

My Friend, 4 kids and gold and silver coins

The other day I met an old college friend in a coffee shop. We both were students in the Math department of that college. Here was our conversation (after the small talk) We are meeting first time ...
1
vote
2answers
739 views

solve this 8-puzzle

This quiz is about the 8-puzzle. It is a board with 9 fields. There are 8 tiles with numbers from one to eight. One field is empty. You can slide numbers around the board: But only numbers next to the ...
9
votes
2answers
8k views

Crack the 5 digits code

I created this "crack the code" puzzle. I hope the members here like it.
30
votes
2answers
2k views

Parallelisation

An entry in Fortnightly Topic Challenge #32: Grid Deduction Hybrids Puzzlers, I am presenting a set of six duo-grids! Of course, I need to tell you how they work - you are given a grid. Looking at it,...
2
votes
1answer
695 views

Move 2 or 3 spaces in this 5 by 5 grid

You have a 5 by 5 Board as shown. You start from the S (Center) position. You can: 1 Move TWO or THREE spaces only 2 You can move Vertically or Horizontally or Diagonally but only in a straight ...
4
votes
1answer
605 views

Beating at Eating, a logic-grid puzzle for literal logicians

$\begin{array}{r|lll} &\text{Name}&\text{Surname}&\text{Dessert}\\ 1&\text{Agatha}&\text{Greed}&\text{cream puffs}\\ 2&\text{Bugsy}&\text{Forager}&\text{trifle}\\ 3&...
10
votes
1answer
807 views

How to play Japanese mahjong part 1: Forming hands

Have you ever wanted to learn mahjong but thought the game was too complex to get started? Well this puzzle will help you learn the basics of forming hands! So come on, what are you waiting for? ...
7
votes
3answers
386 views

A colorful wheel

Here's an interesting puzzle. This is called "Rudenko's Disk" (Brainwright) — finding information or solves for it online isn't all that challenging, which would largely ruin the fun here, so ...
5
votes
1answer
1k views

Difference square logic (5x5)

Rules : Arrange numbers 1 to 25 to the squares, and each number only occurs once. Green squares are the difference from its left square and its right square. Green squares are also the difference ...
1
vote
2answers
137 views

How many answers are there to this alphametic?

If you take a problem of the form: abc +def ---- ghij where each letter must be replaced by a different digit (that is, all digits, 0-9 must be used once), how ...
14
votes
3answers
1k views

If 6 was 9, or 100 was 64, or M was N

         Now if a 6,          Turned out to be 9,          I don’&...
9
votes
2answers
365 views

Looking for another partition of 100

The sum of ten, not necessarily different, positive integers is 100. If placed adequately on the vertices of this graph, two of them will be joined by a line if, and only if, they have a common ...
0
votes
1answer
163 views

Don't give me that line [duplicate]

Note: This puzzle cannot be solved on the computer. Draw it out on paper and then solve... ...
12
votes
4answers
1k views

The Special Numbers

Let's try to find out the numbers satisfying the cryptarithms below; $ab=(a+b)^2$ $abc=(a+b+c)^3$ $abcd=(a+b+c+d)^4$ There are only 3 unique answers! Note: $a$,$b$,$c$,$d$ are all ...
10
votes
1answer
690 views

The old calculator v2

This is related to the question asked before: Buttons on an old non-scientific calculator are less sensitive We have chosen 5 different integer values ($a,b,c,d,e$), and written them in an ascending ...
7
votes
1answer
373 views

Arrange numbers to the triangles, so the sums are equal to S

Rules: Arrange numbers from 1 to 11, and each number can appear max twice. The numbers are arranged, so that any 3 numbers which forming an up-triangle sum to the desired number (S). A equal sign ...
15
votes
2answers
1k views

Find out the rule, then solve it

First, Find out the rule from the example, Then solve the puzzle without computer. The answer must be unique (just 1 valid answer). Example Solve This
-4
votes
2answers
203 views

How does the Kangaroo cross the Highway?

A Kangaroo wants to cross a 3 lane highway, all cars going in same direction. All lanes are 7 feet wide. In lane A a car passes every 4 seconds In lane B a car passes every 3 seconds In lane C a ...
7
votes
2answers
319 views

Arrange numbers to 3x3 square with concentric (Addition and Difference)

2 Similar questions: I. Difference Arrange numbers 1 to 8 to replace the letters so: A = abs (B – D) C = abs (B – E) F = abs (D – G) H = abs (E – G) To eliminate duplicates by rotation and ...
18
votes
2answers
2k views

Math logic Triangle

Rules Arrange numbers from 1 to 15 to the white triangles. A op B = result Green triangle means 2 numbers of its side are adjacent numbers. (-) means find the difference (/) means divide the bigger ...
4
votes
2answers
169 views

Representation of Mo-roman numerals

This continues the spirit of Mo-roman numerals started by humn What is/are the natural number(s) that has/have the most different representations in mo-Roman numerals and what is the number of ...
13
votes
2answers
496 views

A mo-Roman sampler

    Pluck some relatively easy mo-Roman mini-puzzles while there’s relatively easy pickin’s. What two English words, taken as mo-Roman numerals, form the same number? ...
19
votes
2answers
994 views

Self-intro to mo-Roman numerals

Here come mo -Roman numerals — just like Roman numerals, only mo’ so.   (Explained as we go.)   What number can spell itself in two different ways ...
12
votes
3answers
2k views

Want to go from MANILA to UGANDA

How do you get from the word MANILA to UGANDA in the shortest time? You can change up to 3 letters at a time to form a new 6 letter word which MUST be either a Country name or a Capital of a country. ...
13
votes
2answers
839 views

Delete a digit then sum

Take a number $(x)$, then create the complete list of the numbers formed by deleting single digits from its base ten representation $(d_1,d_2,...,d_n)$. If the sum of those new numbers equals $x$ we ...
10
votes
1answer
492 views

Labelling a graph with a partition of 100

Label the vertices of this graph with positive integers (repetitions allowed) whose sum is 100 in such a way that any pair of vertices are joined by an edge if (and only if) they have labels with a ...
7
votes
1answer
335 views

1 crossword and 2 connected alphametic (more clues)

Rules : Solve the Crossword. The words can be written backward (example zebra -> arbez) After finishing the crossword, solve the alphametics. The crossword is only uses 10 letters. Each letter ...
6
votes
1answer
199 views

Archaeological alphametic

Enigmarchaeologists uncovered an ancient Roman precursor to our familiar, and comparatively dignified,   SEND + MORE = MONEY  alphametic.   ...
2
votes
1answer
1k views

Fill in the 3 letter blanks

Please fill in the 3 letter blanks in the following numbered list 1 --- 2 CAD 3 --- 4 CNY 5 --- 6 AUD 7 --- 8 ARS 9 --- 10 --- Please no computers/internet. A complete list would ...
15
votes
1answer
892 views

Word in a phone call

This is a 6 letter word 123456 these numbers represent the letters in the word. Here is the short phone conversation betweeen 2 friends -Hello -Hi 346 -Hey 2356, where are you? -123456, Europe! ...
5
votes
2answers
409 views

Dotty Morse code morsel

While puzzling some Morse code I heard an outburst from the bacchanal next door and jotted it down.         “...
8
votes
3answers
537 views

Ambiguous Grids

After six to eight weeks of waiting, your Shmikoli™ Ambiguous Grid Deduction Puzzle Set has finally arrived! You tear into the box only to discover that the instructions are missing. You shouldn't ...
10
votes
1answer
526 views

Oriental House: An original grid-deduction challenge

A different approach to an old concept of mine, Oriental House is a new grid-deduction puzzle based once again off exits and entries. The rules are as follows: Draw a path from S to F, passing ...
39
votes
4answers
2k views

Five Slitherlinks

Solve five Slitherlinks, each with a unique solution. Please say a word regarding (or show an image depicting) each solution method.
12
votes
3answers
1k views

One year celebration

I've got notified a few days ago from PSE that my account on this website is 1 year old. So I thought about celebrating it (or commemorating it, because you all made me addicted to this) with a puzzle ...
6
votes
1answer
251 views

I soundly slept, but when I rose

I soundly slept, but when I rose, my papers showed disheveled prose. At once I knew the imp had been again among the realms of men... Minimum ward to get by on (6) To celebrate their love of ...
1
vote
3answers
889 views

The confusing cat [closed]

I have a cat. The cat found a mouse. The mouse fled and found a keyboard. The keyboard was pressed by me and on the monitor appeared a 5-letter word with the 1st and 4th letters the same. Then the cat ...