Questions tagged [calculation-puzzle]
A puzzle that involves numerical calculations, such as multiplication and addition.
803
questions
1
vote
1answer
141 views
Cut the string!
There are five pieces of blue string on the table with different lengths, the total length of which is 30 cm. There are also five pieces of red string with different lengths, the total length of which ...
4
votes
2answers
225 views
Place 4 players to make 6 distances between pairs
Is it possible to place 4 players on a football field in such a way that the 6 distances between every pair of them are 1, 2, 3, 4, 5, 6 meters?
Source: Moscow Math Olympiad 2001 (Look Inside to Page ...
-2
votes
2answers
80 views
Drawing a line with a ruler [closed]
Imagine we have a ruler on which just numbers 0 and 2 and 5 are marked and the rest numbers are erased. How could we draw a 6 cm line by this ruler?
7
votes
1answer
187 views
Long division cryptarithm - KLMN/HIJ = K
The problem statement:
Solve the following long division problem. Each letter represents a unique digit (0-9)
...
2
votes
3answers
86 views
Form a magic square with assorted numbers
Arrange the following numbers in a way such that all rows, columns and the diagonals add up to the same number.
...
-4
votes
1answer
109 views
Use only πs to get e
I am taking this puzzle from inspiration from the Four Fours to get Pi puzzle. The puzzle rules are just slightly different. Here are the rules:
You are trying to get as close to e as possible with ...
6
votes
0answers
156 views
This puzzle's value is 334
The 28th of october is valued by 40. This sentence is valued by 17. This paragraph is valued by 143.
This puzzle is valued by 334.
Can you give the value of Puzzling StackExchange?
12
votes
2answers
1k views
A logical puzzle about a pet shop
I am an undergraduate student studying languages and give private lessons to secondary school students to help them learn English. Recently one of them suddenly asked me during a lesson whether I ...
-3
votes
2answers
142 views
Using the number 8 6 4 2 = either 19 or 17 [closed]
The numbers can only be used once.
You can use any operator from BEDMAS.
-2
votes
2answers
116 views
Using the numbers 8642 = 9 [closed]
Using any calculation in BEDMAS use the numbers 8645 = 9
Numbers can only be repeated once.
3
votes
1answer
447 views
10 dummies play a game of Among Us
This puzzle is based on Among Us; however, knowledge of the game is not required for this puzzle.
10 dummies are on a spaceship, in which there are 3 impostors and 7 crewmates.
For the sake of ...
5
votes
2answers
248 views
Find the missing value in the given figure
Find the missing value value in the given below figure
Choose the correct option :
(a) 22
(b) 34
(c) 36
Could anyone give me hint to crack the logic in this figure to get the missing value? I tried a ...
6
votes
7answers
1k views
Math Challenge: Create 8
Using only $2$, $7$, and $7$ (each one must be used only once) and only using the operations $+$, $-$, $\times$, $\div$, $\textrm{^}$, and parentheses, make 8. You can also use decimals.
3
votes
1answer
83 views
The waking of Mr. Greene [duplicate]
I always enjoyed math problems that, at first sight, seemed hard to solve but, if you look them from the right perspective, they turned to be really easy. One of my favorites is:
Mr. Greene takes the ...
-1
votes
2answers
102 views
The Range of Taxi Fares [closed]
You are in the back of a NYC taxi, and know exactly how fare your trip was in miles (m), and exactly how long it took in hours (t). The taxi driver gives you bill, but you want to make sure they've ...
18
votes
4answers
2k views
I don't want the smallest one, I want the second-smallest one
Inspired by my struggles with a certain open-source online learning platform's grading system:
You are working in a computer language with a limited set of built-in functions. You have a set of $m$ ...
7
votes
2answers
236 views
Find the ages of mathematician's children
Mathematician: "It was the August of 1997 when they barged into my house..." - Here is his story:
Students surprised their mathematics teacher with a cake on his birthday. The teacher was ...
2
votes
2answers
271 views
Escaping the Infinite Blackboard
You wake up in a world with an infinite blackboard and hear a voice. "Let's play a little game. In front of you is a infinite blackboard. You may create a new number by adding a power of $2$ to ...
0
votes
1answer
111 views
Here's an ancient puzzle [duplicate]
Two market women were selling their apples, one at three for a penny and the other at two for a penny. One day they were both called away when each had thirty apples unsold: these they handed to a ...
2
votes
3answers
121 views
How to find the number of ways to go from one point to another in a truncated structure?
I've found this problem in my book "Riddles and reason" and after several attempts I still have no idea how to tackle it.
The problem is as follows:
The figure from below shows a truncated ...
8
votes
1answer
384 views
Whose birthday is it?
A group of people have gathered for a birthday celebration. Their ages are related as follows:
The product of the 1st person's and the 2nd person's ages is $311\frac{2}{3}$ plus the 3rd person's age.
...
2
votes
2answers
143 views
Calculation puzzle 012
What's A + B = ?
I found A=60 and B=63x4=252, thus A+B=60+252=312; but, source says that's wrong answer.
Source: This question was asked in YTU exam for int'l students in 2018. I have discussed about ...
1
vote
1answer
77 views
0
votes
2answers
85 views
Calculation puzzle 010
Find the missing number in the sequence.
2 9 28 65 ? 217
Source: This question is taken from YTU YOS 2018 exam. I have mentioned them in other posts.
6
votes
4answers
441 views
Maximum amount of the Letter-Number-game
There is a number-game which you play like this:
You think of a number eg. $8$.
Then think: How many letters does this number have? In our example: $5$
And now do step one with $5$
This goes on ...
9
votes
1answer
234 views
Another problem with ages
Remember the famous three kids problem with the oldest one who plays the piano? Take a look at the next one:
A priest and a verger were travelling on a train carriage with three more passengers.Then ...
4
votes
2answers
264 views
The ferries over Mississippi
Here's an old challenge from an old book (I think it goes like this, if I remember well):
There is a place on Mississippi river between Missouri and Kentucky where are two ferry boats: the vintage ...
0
votes
1answer
119 views
Can a 10*10 binary puzzle have more than 1 solution? [closed]
I was trying to solve 10*10 binary puzzle and when I checked with the answer given in the book, the solution in it was different from mine. I did not repeat 1 or 0 more than twice in any row or column....
3
votes
2answers
191 views
1
vote
1answer
116 views
2
votes
2answers
74 views
Calculation puzzle 007
What is x?
76 26 24 24 30 x
There is a connection between these numbers. Based on that connection, find x.
Possible answer is
Source: This question was ...
4
votes
3answers
2k views
What is the value of ⍰?
This is a question that I have been unable to figure out an answer to. Moreover I can't figure out what it relates to. It was given on a programming proficiency test.
the question mark symbol ...
23
votes
5answers
1k views
Painted faces on a cube
Here's another challenge I used to give to my students:
Let's begin with a bunch of little white cubes assembled into a big white cube. All the little white cubes are equal. Then I decide to paint ...
6
votes
1answer
215 views
The river and the log
I gave the next problem to my students the other day to show them that, if we learn to see our problems in a different new point of view, we may be solving them on a much simpler way.
A lumberjack ...
5
votes
1answer
124 views
Competitive puzzles
Do you know any sort of puzzles that can work in the context of a short competition? In other words, puzzles that have these features:
The premise should be fairly simple to follow (but the solution ...
6
votes
1answer
248 views
Crosswords: Maximum number of words in an n×n grid
What is the maximum number of "words spaces" that can be in an n×n crossword, based on the placement of the shaded squares.
Some limitations
No word can be less than 3 spaces in length
...
-4
votes
1answer
110 views
What number should be placed in that last slot? [closed]
I came across a very difficult puzzle.
What number should be placed in that last slot?
I only know 16 is not the correct answer, because 11 is before 10.
7
votes
2answers
430 views
Dog's mead AKA The Little Pigley Farm
This is not a puzzle, this is a question about a certain puzzle, Dog's mead. Several forms of this puzzle have been known, and I'm referring to this particular form. There are some history on that ...
4
votes
1answer
149 views
Find the missing numbers in these flowers
Can you figure out the pattern and solve for the three missing numbers?
All petals and centers each contain a single digit.
There is a unique solution for each missing number.
Hint 1:
Hint 2:
8
votes
6answers
2k views
How many scouts are there?
At camp every tent is given a number. My twin lives at the reverse of my tent number. The difference between our tent numbers ends in two. What are the lowest possible numbers of our tents?
A problem ...
2
votes
1answer
102 views
Calculation puzzle 006
Find the number which corresponds to the place indicated by the question mark.
...
3
votes
1answer
181 views
Calculation puzzle 005
396 ? 556 99 872 664
I tried to solve it but to no avail. Possible answers are 666, 491, 654, 999 and 917; since, the exam was multiple choice we were ...
7
votes
2answers
690 views
A Covid-19 puzzle: Alcohol for your School!
You are the principal of a primary school in HK. Schools are resuming soon, and you have to ensure that your school have enough alcohol. Each of the 30 classrooms should have a bottle containing 500mL ...
5
votes
0answers
151 views
Find the next country and the parameters
I created this puzzle.
Denmark = [1 or 4, 11880, 1, 15, 4.433687003, 4 or 5]
India = [11803, 381024, -1, 23, 0.3706062241, 5]
New Zealand = [8916100448256 or 302875106592253, 43680, -1, 40, 0....
11
votes
5answers
906 views
Wizard creating a jewelry
I have a puzzle game which I am not sure how to prove that I have the right answer.
The Puzzle is the following:
We have a wizard which makes very special jewelry (a straight line with beads). ...
4
votes
1answer
131 views
Numbers Relation Puzzle
I've written a numbers relation puzzle, I'd like to share it with you and see what you fellas think.
------
Try to find the relation between the numbers------
Good to know: there are 2 parameters ...
3
votes
1answer
174 views
Three tables, One logic and Nine numbers to guess
Here is a table divided in three parts, the first two (the green and the yellow ones) are completely clear, while the last one (which is red) has 9 numbers to guess (α1, β1, γ1, δ1, α2, β2, γ2, δ2 and,...
13
votes
6answers
1k views
Create integers using 1, 2, 3, 4, 5, 6, 7 and +, -
There are numbers $1, 2,3,4,5,6,7$ and signs '$+$' and '$-$'. Using only these numbers and signs, you can compose expressions and calculate the sum (difference). Concatenation operation is not valid.
...
6
votes
2answers
454 views
Logical task for math
I have one Math puzzle to which I think I found the solution but wanted to check your opinion on it. The puzzle is the following:
George has 1 banknote of 100 (the currency does not matter. Lets name ...
-1
votes
1answer
86 views
Which is higher John's new salary or Brad's salary or equal? [closed]
John's salary is 30% less than Brad's salary. John left work and joined a new institution, where his salary was 30% higher than his old salary.
Which is higher John's new salary or Brad's salary or ...
