# Questions tagged [mathematics]

A puzzle related to mathematical facts and objects, whose solution needs mathematical arguments. General mathematics questions are off-topic but can be asked on Mathematics Stack Exchange.

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### Scientifically Themed Rebus/Dingbats - Part 3

The same idea as before: the "scientific" expressions represent some form of popular media. Enjoy. Part 1 Part 2
1k views

### 222 x 555 = hill

When I multiply numbers that contain twos and fives, I get a number, the digits in which first increase and then decrease, for example: ...
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### A question based on cutting a wire to form a tetrahedron

I am trying exercises of Quantitative Aptitude and I am unable to work out how this problem can be solved: As a tetrahedron has 6 edges, I thought 5 cuts should be required. But that's wrong. Answer ...
2k views

### A puzzle question asked in mathematics exam

I am self studying for an exam and I am unable to solve this quiz question. I tried to find the numbers in the sentences but I couldn't find them and I think that's a wrong approach. Can anyone ...
861 views

### Unable to solve a question asking to find the missing number in sequence

I am trying some quantitative aptitude questions and I am unable to solve this particular question: Unfortunately, I have no clue how it can be solved; I am not able to start. However, I know the ...
222 views

### Question which is sort of puzzle from mathematics Exam

I am self studying and trying questions of quantitative aptitude in my mathematics exam and I am unable to solve this problem. Of three persons $A$, $B$ and $C$, one always lies while the others ...
590 views

### The numbers on blackboard

The numbers $2020,2019,2018,...,1$ are written on the blackboard from left to right. John repeats the following process until there is only one number left: John chooses the first two numbers from ...
253 views

### Math tapestry puzzle #3

Continuation from Math tapestry puzzle #2 Now things are heating up, it looks like this is slowly becoming bigger. I saw my friend Anna working on her tapestry. She asks me, "Do you like it?"...
178 views

### Swapping the first and last digits of an integer

Take any n-digit integer (n > 1) and interchange its first and last digits. If neither of these is 0, and they are different, does it happen infinitely often that the resulting number is a multiple ...
232 views

### What is the maximum length of sequence where the sum of 5 consecutive numbers in positive and sum of 8 consecutive numbers is negatve

What can be maximum length of such sequence? Hint one such sequence is
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### Find the unique passcode

"Is this the Coldport Lost Property Office? I think I left my puzzle-book on the train this morning, and I was hoping someone had handed it in." The speaker was a tall gentleman with a six-...
402 views

### All wrapped in functions

Find all functions $f:\mathbb{R}\rightarrow\mathbb{R}$ such that $$f(x)f\big(f(x)+y\big)=f\big(x^2\big)+f(xy)$$ for all $x,y\in\mathbb R$ Problem by me Most elegant solution wins!
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### Complete this cross sequence

What is the next element of this sequence and why? Possible choices: Hint 1 Hint 2 Hint 3 Hint 4 Hint 5
161 views

### Missing number in a set of four segment circles

This is a puzzle posted on a social networking site that I have been trying hard since yesterday to solve: My approach has been to find out a mathematical function with the numbers in the yellow, ...
196 views

### Is this Series limited to six numbers only?

May be this problem is already answered. I am not aware. What is the next number in the following series? Importantly, after that number, are there any more numbers? is there a math related reason for ...
625 views

### Lock Optimisation

In a simple combination lock, a sequence of several digits is used as a password, with one wheel per digit. Generally, it is not possible to unlock the lock without knowing the password, but due to ...
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### Tangential circles

The following figure has two axes of symmetry which define its width and length. The length (horizontal distance) is twice the width (vertical distance). The largest circle has a radius of 2005 and ...