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Questions tagged [calculation-puzzle]

A puzzle that involves numerical calculations, such as multiplication and addition.

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2answers
97 views

Math quiz from a book [closed]

A student took some exams. The arithmetical average of his grades is 25. He takes another exam today and he gets a 30, so the arithmetical average of his grades becomes 26. How many exams did he take, ...
5
votes
1answer
125 views

Number Sequence Series-Question 6

This a series of questions that are created by myself. Since question 6 is not that difficult I will not give any hint to you guys. Enjoy the test. Here is question 6: 2,6,8,7,5,3,? $$$$ If you ...
3
votes
1answer
102 views

Number Sequence Series-Question 5

This a series of questions that are created by myself. I will give a hint in 24 hours and my answer in 3 days given that nobody could answer my question. Here is question 5: 342,765,?,242325 (It ...
2
votes
3answers
91 views

Number Sequence Series-Question 4

I want to share a series of questions that are created by myself. I will give a hint in 24 hours and my answer in 3 days if nobody could answer my question. Previous ones are here: Number Sequence ...
2
votes
1answer
146 views

Number Sequence Series-Question 3

I want to share a series of questions that are created by myself. I will give a hint in 24 hours and my answer in 3 days given that nobody could answer my question. Here is my number sequence: 2020,...
3
votes
2answers
154 views

Can you express this orderly Palindromic Devil in strict ascending Pandigital form?

Given: Devil as you know is $ 666 $ Using digits 1 to 9 in strict ascending order and only three mathematical signs ( +, -, /, x ... of these are allowed), write the Pandigital expression $ 666 = ...
1
vote
1answer
173 views

Be a Wizard..Find the missing digits of this 41 digit Humongous Palindromic Square!

Absolutely No calculators or computers. Only Simplest Method for finding the missing digits will be accepted as the right answer. Given: The square of this 21 digit number $ 229 359 782 235 085 ...
4
votes
1answer
280 views

Number Sequence Series-Question 2

I want to share a question that is created by myself. I will give a hint in 24 hours and my answer in 3 days given that nobody could answer my question. Here is my number sequence: 1441,2882,5764,?,...
4
votes
3answers
315 views

Number Sequence Series – Question 1

I want to share a question that is created by myself. I will give a hint in 24 hours and my answer in 3 days given that nobody could answer my question. Here is my number sequence: $3/2, 2/3, 3/4, ...
5
votes
1answer
324 views

Find the next term

Here, we have a sequence. 0 , 15 , 23 , 155 , 287 , 539 , 767 , ? Can you find the next element ? HINT 1 HINT 2 HINT 3
0
votes
1answer
130 views

How much did he pay for the car? [closed]

A man withdrew half the money that was in his bank account to buy a second-hand car, then sold the car two weeks later, receiving only three-quarters of the price he had paid for it. When he paid the ...
5
votes
3answers
306 views

How to solve this number-sequence?

My friend gave me this fun puzzle to solve but I still cannot figure out the logic between them... 1,3,4,7,8,11,14,15,19,22,23,25,26,?,?,?,? Could anyone help me solve it?
17
votes
3answers
2k views

France's Public Holidays' Puzzle

In France, there are 11 public holidays. As a French employee who enjoys public holidays on week days, you want to know if it is possible that all of the 11 public holidays during one year fall on ...
5
votes
2answers
171 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
102 views

Max pieces to cover a chess board [closed]

Number of individual chess pieces to cover all chess board
1
vote
1answer
203 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
332 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
99 views

Can you Solve it [duplicate]

----- + ----- + -----= 30 Use only (1,3,5,7,9,11,13,15)
14
votes
2answers
412 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
241 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
405 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
149 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
87 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
260 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
397 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
279 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
200 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
222 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 ...
6
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
174 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
102 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
661 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
222 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
295 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 ...
4
votes
1answer
430 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
157 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?
18
votes
3answers
5k 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
267 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
360 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 ...
8
votes
7answers
2k 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
376 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
97 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
425 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
526 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
557 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
307 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
113 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
122 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 ...