Questions tagged [calculation-puzzle]
A puzzle that involves numerical calculations, such as multiplication and addition.
3
votes
1answer
28 views
Two, completely independent, means exist to obtain the same answer
... one "local"; and one "global"
1) 1 + 1 = 2
2) 2 + 1 = 4
3) 3 + 2 = 9
4) 5 + 3 = 17
5) 7 + ?? = 32
Can you determine the correct answer ...
0
votes
2answers
74 views
Max pieces to cover a chess board [on hold]
Number of individual chess pieces to cover all chess board
1
vote
1answer
155 views
Extremely Long Difficult Number Sequence
(2 7 4 4 5 7),
(?),
(2 1 3 2 1 7 1 4 1 5),
(2 2 4 1 1 3 1 7 1 4 1 5),
I can't find any links between these numbers, anyone could help me solve it?
1
vote
2answers
268 views
The result is 7 game
The goal of this game is to find the lowest score for the 10 equations below.
0 ? 0 ? 0 ?...
0
votes
0answers
90 views
14
votes
2answers
356 views
Construct $\sqrt{3}$ using every natural number
Construct $\sqrt{3}$ using every natural number $n\in \mathbb{N}$ (1, 2, 3, 4...) exactly once and the operations addition ($+$) and division ($\div$).
8
votes
1answer
199 views
A Number Game puzzle
Our team has created 9 math puzzles with ranging difficulty. Let me share one of them.
At the beginning a number is given to you. Your objective is to get a different number by making choices. Here's ...
7
votes
3answers
376 views
Writing differences on a blackboard
The numbers 25 and 36 are written on a blackboard. At each turn,
a player writes on the blackboard the (positive) difference between two numbers
already on the blackboard, if this number does not ...
3
votes
2answers
130 views
The fantastic matrix
Here's another question that I have been asked in an interview lately.
Let $M$ be an $n × n$ matrix whose values are $”+”$ and $”-”$. M is called fantastic if it is possible to make all it's values $”...
1
vote
2answers
85 views
Fill two dimensional list by meeting given conditions
Suppose you have a 2D array - a list that exits in both x and y axis - which is 4 x 4, and you need to fill the table by putting numbers in it obeying following restrictions.
Each cell is able ...
3
votes
1answer
255 views
Infinite dials to reset ever?
I have an infinite number of dials with red needles that rotate $n\in\mathbb{Z^+}$ times every second. They all start pointing North.
Will they simultaneously all point North ever again?
4
votes
2answers
280 views
How to make 18 from 1, 3, 4, 8
This question was on my sister's 5th-grade homework, practicing order of operations. It was to make 18, using the numbers 1, 3, 4, 8 and the operations +, -, and *. The instructions imply using each ...
3
votes
1answer
186 views
Albrecht Durer Inspired Magic Square
A magic square is an n-dimensional matrix in which each row, column, and main diagonal sums to the same 'magic number' (denoted by s). A normal magic square uses each of the numbers from 1 to n ...
-2
votes
1answer
165 views
How to solve this puzzling?
20190309,245111132328,331508165892,51222189610023,?
A friend of mine gave me this number puzzling but I have no idea what is the logic.
Does anyone know how to solve?
4
votes
2answers
213 views
Digital Font Puzzle. One easy the other may be not
In the Digital Font shown below, each letter is made up of line segments. For example letter A has 6, B has 7, C has 4 segments and so on.
Question 1 ( Easy)
Which english number, when spelled out ...
5
votes
2answers
1k views
What's Bob's age again?
I created this problem myself, but I did have inspiration.
Today is a special day, I'm moving out of my parent's house. My father comes to me and says "Wow, you're half my age. On the day we moved ...
-4
votes
2answers
120 views
Jug problem with 3 jugs [3, 4, 5] [closed]
How do you get 10 and 11 liters from 3, 4, and 5 liter jugs?
-6
votes
1answer
91 views
The master puzzle
Take any angle in a circle
Divide that respective angle in equal proportions up to infinity intervals . Then apply a pattern that I had given below .
The numbers you obtain after doing so should be ...
29
votes
10answers
9k views
Using only 1s, make 29 with the minimum number of digits
Use the minimum number of ones to make 29.
Here is the list of operations permitted:
"Standard" operations, such as: $x+y$, $x-y$, $x\times y$, $x\div y$
Negation: $-x$
Exponentiation of two numbers:...
7
votes
3answers
644 views
Homeostasis logic/math problem
I'm trying to derive a generic formula for a programming algorithm. I might be overthinking this or underthinking it... we'll see.
Each of the triangles below represents a container. Each container ...
-3
votes
1answer
175 views
Word Puzzle: Find The Maximum Words (+Mystery Clue)
Similar to the heart of this, but with different rules, I have developed a new word puzzle.
Partial answers which answer part of it correctly will be upvoted!
Your objective is to find the maximum ...
3
votes
3answers
275 views
Is it possible to methodically find the total of ways to read a given phrase making a stack? [closed]
I have been going in circles for a few days now with this word-search puzzle and I still cannot find a clever solution to the problem. Is there a systematic approach that doesn't involve guessing? The ...
3
votes
1answer
344 views
What is the next sequence of numbers?
Seven and seven is forty-two,
Eight and nine are fifty;
Ten and eleven are sixty-two,
And twelve and twelve are five.
What is the next sequence of numbers?
5
votes
1answer
153 views
What is next in the number sequence?
Two and two is four,
But three and three is nine;
Four and four is eighty,
But five and five is none.
What is the next line in the sequence?
11
votes
3answers
4k views
You surely don't want to score 100/100
The Story:
Today, the Maths quizzes are handed out by the teacher.
You got 100/100. Everyone got 100/100.
But you're not happy with it. Everyone's not happy with it.
You want to ...
1
vote
5answers
233 views
Create all numbers from 1-100 by using 1,3,3,7
Create all the numbers from $1$ to $100$ using the numbers $1,$$3,$$3,$ and $7.$
You can only use each number once, except for the $3,$ of which you have two.
You can use addition $(x+y),$ ...
12
votes
8answers
3k views
Create all numbers from 1-100 using 1,3,3,6
Create all the numbers from $1$ to $100$ using the numbers $1$,$3$,$3$, and $6$.
You can only use each number once, except for the $3$, of which you have two.
You can use addition ($x+y$), ...
9
votes
3answers
348 views
A puzzle in kindergarten's book
I found the following puzzle in a kindergarten book:
Can anyone give a clear explanation as to what the answer is and why?
The first time I tried to solve it I got an answer of 6, by noting that the ...
5
votes
5answers
821 views
How do I make numbers 50-100 using only the numbers 2, 0, 1, 9?
Rules
Use ALL the digits in the year $2019$ (you may not use any other numbers except $2, 0, 1, 9$) to write mathematical expressions that give results for the numbers 50 to 100.
You may use the ...
2
votes
5answers
262 views
Find the missing number in grid
When I doing the IQ paper last Sunday, I found an interesting question. Using that I made a different puzzle.
Hint 01:
Hint 02:
Hint 03:
Hint 04:
Text version:
25 13 43
35 66 53
45 -- 63
55 ...
2
votes
0answers
93 views
Write $\sqrt{5}$ as sums of powers of $1 + \sqrt{2}$? [closed]
The number $A = 1 + \sqrt{2}$ solve the equation $A^2 = 1 + 2 \sqrt{2} + 2 = 1+2A$. We also have that $$0 < \dots < A^{-2} < A^{-1} < 1 < A < A^2 < \dots $$ The powers are in ...
3
votes
4answers
419 views
What will be the next term in this mathematical sequence?
What will be next in this series?
$$0, 6, 24, 60, 120, 210, ...$$
I've tried it and noticed that the numbers are multiples of six. But I couldn't make a relation between them.
10
votes
2answers
515 views
Who gets more money?
There are two people eating bread. One of them has 5 loaves of bread; the other one has 3. They invited a third person to eat with them. They ate all 8 loaves of bread, and out of appreciation he gave ...
2
votes
1answer
224 views
Help solving a math puzzle table
I am struggling to find the answer.
Here is the source: math logic puzzle phone app.
4
votes
2answers
217 views
5 Digit Code Puzzle
We have a 5 digit code, any place can take 1 2 or 3.
How do I find where the 2 is placed (if placed) knowing this criteria?
1) If the 1st digit is not a 3 then the 2nd is.
2) If the 1st ...
3
votes
1answer
112 views
How many possibilities are there for the buried treasure?
You have discovered a map to some buried treasure on an island the shape of a circle. The map has 9 markers which represent posts situated on the edges of the island.
The 9 posts are located; North, ...
3
votes
2answers
116 views
Simple and intriguing
Five friends are sharing information about the marbles they have attempting to derive the total amount of marbles they own without disclosing to others the amount each own. They decide to do it by ...
2
votes
1answer
93 views
14sums - the diamond standard
My initial question had lots of answers, and my second had too many constraints. So, I have removed some constraints and added another. Same rules as before, but we are now using $[0,6]\cap\mathbb{Z}$....
12
votes
4answers
4k views
Doubling/tripling puzzle: make 1 from 1536 in as few steps as possible
You start with the number 1536. Your mission is to get to 1 in as few steps as possible. At each step, you may either multiply or divide the number you have, by either 2 or 3; but, only if the result ...
1
vote
0answers
43 views
Sequence puzzle in rows [duplicate]
The below is a number puzzle. It should be read left to right, top to bottom.
Question 1: What is the next two rows of numbers?
Question 2: How was this reached?
-1
votes
6answers
608 views
How do I make 76 using only the numbers 2,0,1,9? [closed]
I must use each number 2,0,1,9 (only once) to come up with an answer of 76
5
votes
1answer
129 views
21sums - more constraints
My initial question had lots of answers, as we can practically choose the middle square to be anything we want, and work outwards to the exterior edges, with the corners providing the flexibility ...
5
votes
7answers
1k views
9sums - a logical deduction puzzle
Each set of minuses contains an integer in the range [1,5]. The given numbers are the sum of the surrounding 4 numbers.
--- --- --- ---
13 14 11
--- --- --- ---
11 ...
7
votes
6answers
2k views
Through which number we can remove the question mark?
I'm trying to solve this puzzle but so much confused and can't understand even.Please help me to solve this puzzle and also explain briefly.
10
votes
1answer
1k views
Which two numbers replaces the question mark?
I was solving some number puzzles. I am finding difficulty in solving this puzzle: which two numbers will replace the question marks? I need answer with explanation.
1
vote
2answers
400 views
What is the next number in the given series?
I know that next number questions are not popular here, but this one is tough and I couldn't figure out the pattern. To give an idea one of the questions had a pattern of Prime(Fib(n)).
So this is ...
5
votes
5answers
411 views
Time-Motion puzzle
Time and Motion studies are well established.
Here is an easy question:
It takes 8 men 6 months to build 2 houses at a cost of $50,000.
It takes 10 men 5 months to build 3 houses at a cost of ...
5
votes
1answer
452 views
Solve this puzzle. I created for my friend for FUN :)
My friend is very good at puzzles. so i thought of creating one by myself and try to see if he can solve. Finally I succeeded and he gave up.
Interested people can try.
Hint: use all four arithmetic ...
1
vote
1answer
237 views
14
votes
11answers
20k views
Find out the correct number
Find out the correct number to replace the question mark.
Source: Beijing Aidi International School summer test (2018-08-21). Author: 坦途国际教育
