Welcome to the PuzzleUp; a problem and games site where each week a different problem is put accross for you to think on and try to solve.
The fundamental aim of this site is to support and raise persons of the information age who have highly developed capabilities of thinking, perceiving and problem solving and who are able to interpret different cultures and contribute to contemporary civilisation.
To keep us on track and give us direction we look forward to hearing your criticisms and suggestions.
Hoping that wisdom, peace and love will master the future of the world we live in.
Emrehan Halici




Answering Period
Dear Contenders,
Puzzleup 2018 answering period will end at 11:00 (GMT) on December 20, 2018.
Score board will be announced on December 21, 2018.
The competitors will examine the correct answers and their scores for all the problems for a 1 week period.
Any objection will be made until December 28, 2018.
The final score board will be announced in the following week.
Good luck to everyone.
PUZZLEUP  December 13, 2018  06:36

[PRIME NUMBER] 1
Do you consider 1 to be prime?
kublai  November 28, 2018  19:15

[RECTANGLES] Cotation and advice
Hello,
I really like this problem, quite pure, but whose resolution is not quite basic. For the clarification, however, I would have rather phrased it as follows: "The large rectangle may be a square, or not, and one of its side may have the same length as one side of one of the small rectangles".
Puzlifouk  November 15, 2018  12:30

NOTE
Dear PuzzleUp Contenders,
To clarify the meaning, a note has been added:
“Note:The large rectange can not be a square.”
Please take notice and submit your answers accordingly.
Regards,
The PuzzleUp Team
PUZZLEUP  November 15, 2018  12:14

[DIFFERENT DIGITS] digits meaning
if number is 3568
in this number 5 means: five or five hundred??
cem uzun  November 01, 2018  10:55

[DIFFERENT DIGITS] Clarification
Dear PuzzleUp Contenders,
To clarify the meaning, the question text has been changed.
Old: "... each of its digits … "
New: "... each of its digits (except the leftmost digit) … "
Please take notice and submit your answers accordingly.
Regards,
The PuzzleUp Team
PUZZLEUP  November 01, 2018  06:23

[CORDED TRIANGLES] Doubt
Do i have to connect a tree to every other tree with a cord?
Mauricio Mikola  October 10, 2018  12:21

[SCALE] Ouch...
This question will break a lot of egos... i can soo hear the shatters. I was waiting this particular type of question to expand for quite some time.
zugzwang  October 03, 2018  17:57

[LARGEST MULTIPLICATION] Ammendement
Dear PuzzleUp Contenders,
To clarify the meaning, the question text has been changed.
Old: "...numbers add up to… "
New: "...positive integers add up to… "
Please take notice and submit your answers accordingly.
Regards,
The PuzzleUp Team
PUZZLEUP  September 20, 2018  10:11

Scoreboard
Are the randomly chosen questions for the scoreboard the same questions for everybody or are they random too? Thanks
laydogan  September 19, 2018  15:27

Randomly chosen problems are the same for every competitor. PuzzleUp Team [Administrator]  September 20, 2018  10:29

[LARGEST MULTIPLICATION] Only positive or as well negative?
Are we talking about only positive numbers or are negative numbers included as well?
zibelas  September 19, 2018  11:56

[LARGEST MULTIPLICATION] Clarification needed
Are they positive integers?
laydogan  September 19, 2018  11:38

[DICE GAME] "Expected value"...
@ Özcan T:
The "expected value" (mathematical concept of the field of probabilities) of the result of a single throw of one fair 6sided die is (1+2+3+4+5+6)/6 = 21/6 = 7/2 which IS a fraction.
Puzlifouk  September 19, 2018  10:49

[DICE GAME]
Sorry but in this question I am not sure what we are asked to calculate.. Looks like a statement or a part missing.. How can the expected value of points be a fraction?
Özcan T  September 12, 2018  17:51

[NUMBER SELECTION] Explanation : divisibility by 2
To those who do not understand the question of "Number selection", I would only explain  if it is allowed  the solution for divisibility by 2.
Of all three numbers, there are always some: at least two that are even, or at least two that are odd. By adding these two numbers (the two even or the two odd) we can always find Y = 2 numbers taken from X = 3 whose sum is divisible by 2.
If X = 2, this is no longer possible. Counterexample if Y = 1: 3 and 15. It is not possible to select 1 number divisible by 2, since the two proposed are odd.
Counterexample if Y = 2:
3 and 8; it is not possible to select 2 numbers whose sum is divisible by 2, since the only possible choice is 3 + 8 = 11.
QED
Puzlifouk  September 05, 2018  05:01

[NUMBER SELECTION] My explanation
They select any X integers. You select Y of them as you wish. Sum of them (Y integers) will be divisible by 7. Find the minimum number X and Y that guarantees that requirement.
laydogan  September 04, 2018  11:29

[NUMBER SELECTION] I think I get it now
The question should read something like “Given any X integers (not necessarily distinct), if it is always *at least one way* possible to select Y of them whose sum is divisible by 7, what is the minimum value of X and the corresponding value of Y?”
mark_  September 03, 2018  19:34

[NUMBER SELECTION] Can anyone?
Can anyone who understands the question speak to those who can not (like me)?
Enormous  September 01, 2018  23:34

[NUMBER SELECTION] Impossible Question
This problem is paradoxical there is no right answer. If we are looking for a case where the X integers must be allowed to be any integers then we will be able to find counter examples as in other comments. If I’m the other hand we are only looking for a single case which makes this true then the answer will always be 11. To follow the example for divisibility by 2. Picking the internet of 2 then X = 1 and Y would also select the only value possible.
mark_  September 01, 2018  05:37

[NUMBER SELECTION] Sorry
I misunderstood the text, thats okay.
kartalwolf  August 31, 2018  15:42

[NUMBER SELECTION]
It took me all day to understand this puzzle, but the proof that I had the right answer was easy. I congratulate you on posing this elegant puzzle!
Bob Henderson  August 31, 2018  02:07

[NUMBER SELECTION] Objection to the text
When we have two numbers,
even even or even odd or odd odd
Two numbers are enough to select numbers whose sum divisible by 2
For ex
3, 5 here Y=2
Or 3,4 in this case y=1
So x is 2 and Y should be 2
Would you please clarify the text?
kartalwolf  August 30, 2018  06:44

[NUMBER SELECTION] Answer format
"Enter the minimum X, then the corresponding Y without using a space in between."
Does that mean that X and Y must be concatenated, i.e., enter "32" if X=3 and Y=2 for the example?
Because usually we are required to put a "," between the two values.
cchang  August 29, 2018  18:03

The answer would be 32. PuzzleUp Team [Administrator]  August 30, 2018  08:34

About number selection
Sorry but I could not understand the question exactly
Enormous  August 29, 2018  14:56

[NUMBER SELECTION] How to enter the result?
"Enter the minimum X, then the corresponding Y without using a space in between."
In the example where X=3 and Y=2, would that be "32"? Or "3,2"?
Turzz  August 29, 2018  12:25

The answer would be 32. PuzzleUp Team [Administrator]  August 30, 2018  08:35

[NUMBER SELECTION]
if numbers are 1,2,3 then, when chosen 1,2 as given 2, the sum is not divisible by 2. how possible?
kartalwolf  August 29, 2018  12:16

[NUMBER SELECTION]
For the example, X=2, Y=2 (both Integers 1) is possible to divide by 2. Since the two numbers are smaller, where is the error?
zibelas  August 29, 2018  12:10

Difficulty
How is difficulty calculated. I assume a high difficulty means it is harder, correct?
mark_  August 23, 2018  03:54

[DIGIT SUMS] CLARIFICATION
Dear PuzzleUp Contenders,
For clarification, a line has been added to the example:
(1+2+3+4+5+6+7+8+9+ 1+0+ 1+1+ 1+2+ 1+3+ 1+4+ 1+5+ 1+6+ 1+7+ 1+8 =90)
Please take notice and submit your answers accordingly.
Regards,
The PuzzleUp Team
PUZZLEUP  August 22, 2018  18:41

about My Answers
If my answer is correct at the first time , will the My Answers sheets show 100 points or 0 points immediately？
willzhang  August 03, 2018  00:35

It will swow 0 points.
Rule 8. The scoreboard is updated approximately once a month. The points on the scoreboard correspond to correct answers for randomly chosen problems and include bonus points. (The number of randomly chosen problems is equal to half of the total number of problems). PuzzleUp Team [Administrator]  August 03, 2018  10:33

[TRIANGLE, SQUARE, RECTANGLE] NOTE
Dear PuzzleUp Contenders,
To clarify the meaning, a note has been added:
Note: Each shape must have an area greater than zero.
Please take notice and submit your answers accordingly.
Regards,
The PuzzleUp Team
PUZZLEUP  August 02, 2018  08:26

[TRIANGLE, SQUARE, RECTANGLE] Amendment
Dear PuzzleUp Contenders,
To clarify the meaning, the question text has been changed.
Old: "...and a rectangle with distinct side lengths..."
New: "...and a rectangle which is not a square..."
Please take notice and submit your answers accordingly.
Regards,
The PuzzleUp Team
PUZZLEUP  August 01, 2018  15:27



