# mathematics's questions - Chinese 1answer

2.040 mathematics questions.

### 4 Do they have to be integers?

2 answers, 240 views mathematics number-theory
$A^2$ + $B^2$, $AB$, and $A + B$ are all integers. Do both $A$ and $B$ have to be integers? If not, what is an example where they are not?

### 12 Words with Puzzlers

2 answers, 520 views mathematics logical-deduction knowledge
My "friend" (who has absolutely too much time on his hands) made me a DIY Scrabble™ board. He's nice like that. He cut, sanded, painted and even routed out little cradles for the letter tiles. Oh ...

### 2 I'm Gone Before You Know It. What Am I?

3 answers, 158 views riddle mathematics
Here's a crazy riddle for you. Figure out what I am, if you can: I'm gone before you know it, yet I go on and on and on... Can you tell me what I am?

### 6 (Troll Math Question) Divided by sweets

I got "x" number of sweets. I can divide my sweets equally by 1,2,3,4,5,6,7 all the way to 101 friends such that I have no left overs. Find the least number of sweets I could possibly have at first? ...

### 4 Simple Arithmetic Puzzle 2. Or is it?

A second maths puzzle! \begin{align}0+0&=0\\1+1&=1\\2+2&=2\\12.2+6&=20\\12.3+6&=21\\9+(-3.2)&=-10\\7+(-1.1)&=-3\\0.95+(-0.95)&=-1\\e^\pi+(-\pi)&=\quad?\end{...

### 7 Order matters twice

3 answers, 520 views mathematics calculation-puzzle
Mr. Accurado, a keen and sharp eyed professional thought of starting his special assignment at few seconds past midnight. However due to a distraction- which lasted for less than a minute - he could ...

### 2 How cold is too cold? [on hold]

6 answers, 1.073 views mathematics story calculation-puzzle
On a day during a severe winter, somewhere in cold countries, I watched a weather report on a television. The report showed that on that particular day the temperature was 0° ....but due to some ...

### 74 Why does this solution guarantee that the prince knocks on the right door to find the princess?

7 answers, 15.531 views mathematics strategy algorithm
I found this puzzle online: On the top floor of a castle lives a princess. The floor has 17 bedrooms arranged in a row. Each bedroom has doors connecting to the adjoining bedrooms as well as to the ...

### 3 Use 2,3,4,5 to get 26 using only + - * /

6 answers, 239 views mathematics formation-of-numbers
Use 2,3,4,5 and + - * / only once each (it's not necessary to use all of them) to equal 26. I know 2 answers, but there is a 3rd (or more) :)

### 6 Permuting rows and columns to switch white rooks with black rooks

An adversary places eight white rooks and eight black rooks on sixteen squares of a chessboard, subject to these rules: In any row, there must be exactly two rooks, one of each color. In any column, ...

### 3 A football tournament

1 answers, 152 views mathematics number-theory
During a tournament, seven football teams, three European, three South American, and one from Africa, scored a total of 89 goals. The number of goals scored by the African squad was relatively prime ...

### 6 Weird and complex puzzle that we need help with

So basically this is a complex deep web puzzle and we're pretty much stuck at it right now as we don't have any idea what this is about, any help will be aprreciated (the attached images are the ...

### 2 How many mice are needed to determine which bottle contains poison? [duplicate]

0 answers, 71 views mathematics logical-deduction
I have 100 (one hundred) bottles of visually identical water, exactly one of which is poisonous. In this experiment, the only test I can do is to let some mice drink it. If a mouse drinks the ...

### 5 Stuck in Space - Part I

1 answers, 104 views mathematics enigmatic-puzzle
I've been transported through a wormhole to a new planet in a new universe. Standard stuff, really. But something is... off about this planet. Sometimes, walking around it, I just feel like I'm ...

### 6 Mathematical Rebus III

3 answers, 628 views mathematics rebus
Mathematical Rebus I Mathematical Rebus II Small note on the first image: Hint 1 for the squares image: Hint 2 for the squares image: Hint 3 for the squares image (alternative image that should ...

### 9 A cooperative guessing game - Guess your order and card

7 answers, 360 views mathematics probability cards
6 players sitting in a circle and each assigned a card among 2 Hearts, 3 Hearts, ..., Ace Hearts (i.e. any of the Hearts cards). Holding her card above his forehead (i.e. Indian Poker fashion), each ...

### 16 These four numbers make 25

The sum of the whole is 25 Large and small are different by 4 The first is 2 times the fourth Third is equal to first What are the four numbers? This is really bugging me can not figure it ...

### 16 What did I do yesterday Rebus?

1 answers, 1.018 views mathematics rebus
What did I do yesterday ? Above image is the rebus. Src : slightly copied .

### 4 How likely is a comeback in basketball?

1 answers, 197 views mathematics probability
For this most recent NBA season, ESPN.com has had in-game win probabilities: My question: Say a team gets a big lead and has a 90% chance of winning. What is the probability that at some point ...

### 3 Number circle with gaps

Does anyone know what this is and how to solve it? Thank you.

### Data Sharing Between 3 Players [closed]

Consider a situation in which two companies hold data about individuals: the first company holds individual's names, and their age. The second company also holds the individual's name, but instead of ...

### 33 stones into gold transmuter

There is a magic transmuter which turns stones into the gold! But this transmuter works weird. Every time you put a stone or more stones and press a button, it takes that stone into a slot in the ...

### 19 An unusual and very hard number sequence problem

3 answers, 2.263 views mathematics number-sequence