Questions tagged [calculation-puzzle]
A puzzle that involves numerical calculations, such as multiplication and addition. Use with the [mathematics] tag.
1,122
questions
6
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Connect the dots x Crosswords
About the puzzle:
This puzzle is a crossover of "connect the dots" puzzles and crossword puzzles. It requires the solver to place dots on the graph using crossword-like clues. Then, dots ...
- 96
4
votes
1
answer
97
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The 50 game between two players, selecting numbers between 1 and 10 inclusive + variations
This is a cross-post from MSE: https://math.stackexchange.com/questions/4900281/the-50-game-between-two-players-selecting-numbers-between-1-and-10-inclusive
Let's play a game with two players, with ...
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28
votes
1
answer
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Where is the large cook promotion?
The time is 8:59 or ...
Where is the large cook promotion?
3,4,2
Partial answers are welcome. A complete answer will use/explain all of the above.
- 58.4k
4
votes
1
answer
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Ernie and the Kzijekistanian Coup
A couple of days ago I noticed an article in the International News section of our local newspaper headlined Kzijekistanian Empress Abdicates. Reading on, I discovered that she "… stepped down ...
- 53.3k
6
votes
1
answer
256
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April Fools Origami Update
Me (Sunny Lu) and Ωmega_3301 have made a special April Fools edition of origami puzzles.
The objective is to fold a shape into a rectangle with uniform thickness. The thickness will be given to you.
...
- 8,653
10
votes
3
answers
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Fix the addition so that the sum is 1,111
111
333
555
777
+ 999
-----
1,111
The above addition is not correct. Can you fix it?
For which numbers $n$ can you change $n$ of the $15$ digits of the ...
- 9,886
2
votes
1
answer
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views
-3
votes
1
answer
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Alphametic from programming class
The below question is from one of my assignments for Login Programming for Artificial Intelligence.
ABCDE
CFGH
--——-
DEHIJ
Each letter A,..., J represents a ...
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0
votes
3
answers
284
views
13
votes
7
answers
2k
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Fewest number of prisoners needed
You are an assistant to the king, who has scheduled a party tomorrow. There are 1000 wine bottles in the king's possession, and unfortunately, 3 of them are poisonous. Consuming from any of these ...
- 8,653
12
votes
1
answer
634
views
Ernie and the Chocolate Bomb
Last week when I visited Ernie he complained that his trousers had shrunk in the wash. I suggested an alternate possibility – he was putting on weight. So he decided to go on a diet and to support him,...
- 10.4k
4
votes
4
answers
419
views
How to make 2012 by using 2, 0, 1, 2?
How to make $2012$ by using $2, 0, 1, 2$?
Allowed Operations:
Addition, Subtraction, Multiplication, Division, $!$ (factorial), subfactorial ( $!n$), primorial (product of the first $n$ primes), ...
- 103
2
votes
1
answer
612
views
Make the numbers 1-100 using 8 8s
Rules: Make the numbers 1-100 using eight 8s. Use the operations +, -, *, ...
- 1,237
6
votes
2
answers
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BROWN + YELLOW = PURPLE [closed]
This is a Cryptoarithmatic, where each letter denotes a single digit number. Find values of all the letters.
BROWN + YELLOW = PURPLE
Please show your method for solving this question.
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votes
3
answers
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Walking in a random direction
I walk $\pi$ km in one direction followed by $\pi$ km in another direction. In expectation how far am I now from my starting location? Both directions are chosen uniformly at random between $0^{\circ}$...
- 13.7k
0
votes
1
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Water and Milk Mixture Problem [closed]
There is a 100 liters of milk in a container.
5 liters of milk removed and replaced with water
Once again 5 liters of mixture removed and replaced with water
Now how you calculate to find out the ...
- 242
18
votes
4
answers
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Make 27 using 1, 1, 1, 1
Make the number 27 using 4 instances of the digit 1. You must use all 4 digits to make it count.
Here are the allowed operators:
Addition (+), subtraction (-), multiplication (*), division (/)
Square ...
- 12.6k
2
votes
1
answer
154
views
Unique day of the year
I made this challenge.
Astronomers announced that the sky and the moon will appear violet-velvet next week, and one of their workmates is also celebrating her birthday on the day that the moon will ...
- 58.4k
4
votes
2
answers
459
views
Make expressions equal to 6 using exactly four 4s
You must use all four 4s.
You may use addition (+).
You may use subtraction (-).
You may use multiplication, such as with asterisks (*) and/or grouping symbols.
You may not use any division.
You ...
- 1,788
7
votes
1
answer
1k
views
When was the power restored?
The power went out last night. The stove clock is flickering and showing 7:54 AM. The cell phone shows 7:07 AM. When was the power restored?
- 3,349
7
votes
8
answers
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Divide 3 cakes into 4 equal parts?
You have three cakes of diameter 20cm, 16cm and 12cm respectively as shown in the
figure.
They all have the same height. Now your task is to divide these 3 cakes into 4 equal parts and you are ...
- 13.7k
8
votes
2
answers
742
views
Letters to Numbers: What goes in the blank circle?
This is a letter to number conversion and pattern puzzle.
What number goes in the blank circle and why?
Each letter is a distinctly separate digit from 0 to 9. (There are 10 letters representing 10 ...
- 141k
1
vote
1
answer
105
views
Happy New Year 2024 free drinks party [closed]
You have many friends and they like to drink*. So you decided to throw a whole-day party and invite them for a party with a free drink every hour.
During the first hour one friend comes and you offer ...
- 29.8k
3
votes
1
answer
279
views
Return to Montague Island, puzzle 5.2, quiz 5 [closed]
On this quiz, 005227 encodes the name Abby and 716123863 to Taylor. The key has something to do with encoding each letter as base 3 (c=010) and then writing the numbers in a column and reading down. ...
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45
votes
1
answer
4k
views
A strange operator on my new calculator
Yesterday, I bought a new calculator in an antique shop. I wanted to try some basic operations to see if it was working well. Everything felt right, except for the + sign: it seemed like it was ...
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3
votes
3
answers
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can you figure out how five plus nine equals six? [closed]
Quick riddle here for you 5 + 9 = 6... how?
I look forward to hearing your answers, and I am writing this part in the hope it allows me to submit. (it did!)
- 141
12
votes
1
answer
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views
Relatively prime numbers
Can you fill in the circles with numbers such that:
Each pair of circles connected by one line contains relatively prime numbers
Each pair of circles connected by two lines do not contain relatively ...
- 1,491
0
votes
1
answer
183
views
Find the wrong number in the given series
I found this question in an Indian Highschool Reasoning Olympiad.
I tried looking for any relation using powers of 2 but failed.
- 136k
2
votes
1
answer
168
views
5
votes
1
answer
805
views
Minimum number of turns
You have 64 identical-looking boxes numbered from 1 to 64, each weighing a distinct amount. On a turn, you can tell your friend two numbers between 1 and 64, and she will tell you which of the ...
- 77.4k
4
votes
4
answers
493
views
Magic: the Gathering - Challenge #6: Going Mental
Previous Challenge
Background
Today's puzzle is going to involve Mental Magic, a fun, memory-testing variant of magic. All of magic's usual rules apply, but with the following variations
Any card ...
- 2,241
4
votes
1
answer
144
views
A Squared Cipher
While looking for squares, I stumbled across these numbers, which seemed to form a message:
...
- 6,697
0
votes
2
answers
411
views
A 4x4 sudoku shouldn't be that hard, right? Right?
Note: this is not in conjunction with my Minesweeper puzzles
Got this idea from one of Cracking the Cryptic's videos, I don't remember which one though. This exact puzzle is still overall unique.
...
- 10.4k
4
votes
13
answers
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Let's make a huge number with only tiny numbers
Using only three 1s and two 2s (i.e. 1,1,1,2,2), can you generate the number 55? You can use all mathematical operators you know, such as floor function, factorial, powers/indices*, etc., but ...
10
votes
2
answers
500
views
Shiny cryptarithm
Here's a little puzzle I made today:
$$\sqrt{\text{ILLUMINATE}^{\mathstrut}} = \text{LIGHT}$$
Most usual rules of alphametic puzzles apply here: the same letter always represents the same digit, and ...
- 183
13
votes
1
answer
361
views
What is a Commutative Word™?
This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.
If a word conforms to a special rule, I call it a Commutative Word™.
Use ...
- 10.4k
3
votes
1
answer
285
views
7
votes
1
answer
874
views
Before the Common Era
This is part 39 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
The grid on the left-hand side is a KenKen puzzle. Fill the grid so that every row ...
- 77.8k
6
votes
1
answer
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views
Find the ciphering method 2
Link to the entire series.
The message:
3, 53, 48751, 9247757, 294914580539
The answer is a 13 letter word: UNDERSTANDING
Hint 1:
- 753
18
votes
3
answers
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Sums in a (very small) box
This puzzle is part of the Monthly Topic Challenge #14: Think inside the (very small) box!.
Place the digits 1 to 9 in the box below in such a way that in each row, each column and each diagonal, one ...
- 6,534
2
votes
1
answer
290
views
Find the ciphering method using deciphered message
Link to the entire series.
Ciphered message:
...
- 995
5
votes
3
answers
4k
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Express the number 2015 using only the digit 2 twice
Can you use only two instances of the digit $2$, along with the mathematical operations below, to create an expression that evaluates to $2015$?
Allowed operations:
arithmetic operations: addition ($...
- 5,096
-1
votes
1
answer
224
views
Figure Out The Language: Min
Imagine there is a programming language in which you can only evaluate expressions. Expressions have operators and constants.
There are three types of constants.
Numbers - Any number from 0 to ...
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33
votes
3
answers
2k
views
The Nuclear Missile Standoff
Three world powers have just entered a nuclear war!
They have been waiting for this day for decades; everyone has their nuclear missiles ready to fire, and only need to choose a target.
The Chinese ...
- 625
4
votes
1
answer
538
views
Help a woman from ancient Rome find out how her husband is doing
Let's go back 2000 years. A woman named Valeria received a strange message from her husband Claudius who is a frumentarius.
The message:
...
- 995
-5
votes
1
answer
235
views
Decipher a long sequence of numbers
51699624576811268526783109824167925197245652924177251787241782538786302873119768312852668312686625268245686752824473216878253830287925175273039778250852831287672527245665263006725397251762529312811498
...
- 6,697
16
votes
4
answers
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The Mexican Standoff
There are three cowboys in a Mexican standoff against each other, named Juan, José, and Jorge.
Juan is the straightest shooter in the West, and can hit his target 100% of the time.
José, who has a ...
0
votes
0
answers
74
views
Find the largest number with unique digits, that is divisible by each of its digits [duplicate]
Find the largest number with unique digits, that is divisible by each of its digits.
For example 132 has unique digits and is divisible by 1, 2 and 3. But it is not the largest such number. Can you ...
- 2,704
12
votes
4
answers
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Largest cages Killer Sudoku
Task 1: Find the maximum value of $n$ for which it is possible to create a regular uniquely-solvable Killer Sudoku (9x9) such that every cage has atleast $n$ cells in it.
Rules for killer sudoku
...
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2
votes
1
answer
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A and B don't know their own values
() isn't used mathematically in this puzzle. () means that whatever is inside should be evaluated in the most suitable and ...
- 2,468