Solve Enjoyable Enigmas with Mr.E's Challenge

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Discussion Overview

This thread invites participants to share and solve various puzzles, problems, and enigmas that require creative thinking. The scope includes cryptograms, logic puzzles, and hypothetical scenarios, with an emphasis on engaging the community in playful problem-solving.

Discussion Character

  • Exploratory
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant presents a coded message puzzle, suggesting that each letter represents a word, leading to various interpretations of the message.
  • Another participant questions the phrasing of the original puzzle, expressing concern over perceived misogyny.
  • Several participants engage in playful banter while attempting to decode the message, suggesting alternatives for the letters used.
  • A new puzzle is introduced involving cutting a cake into pieces, prompting discussions about fairness and the nature of the pieces.
  • Another participant presents a riddle involving princes and a princess, asking how a suitor can place a ring on her hand without leaving his corner.
  • Participants speculate about the nature of the solutions to the puzzles, with some suggesting the need for illusion or clever manipulation.
  • A physics-related puzzle is introduced, concerning a cork floating in water, with participants discussing the conditions necessary for it to remain centered.
  • One participant elaborates on the requirements for the glass shape in the cork puzzle, emphasizing the need for a constant height rim.
  • Another participant suggests that the cork's behavior may relate to the meniscus effect, while also humorously proposing an alternative solution involving the princess.

Areas of Agreement / Disagreement

Participants express a range of interpretations and solutions to the puzzles, with no clear consensus on the best approaches or answers. Disagreements arise regarding the phrasing of the original puzzle and the nature of the solutions proposed.

Contextual Notes

Some puzzles rely on specific assumptions about language and context, while others depend on the physical properties of objects involved. The discussions reflect varying levels of understanding and engagement with the puzzles presented.

Who May Find This Useful

Individuals interested in puzzles, logic problems, and creative thinking challenges may find this thread engaging and stimulating.

  • #781
Enigman said:
Another one I can't believe I haven't asked yet...
Its a fruity one too!
(though I don't know if Gad's still following the thread...)
In a closed circular room there are 31 people standing such that everyone can see everyone else. Your job is to place a pomegranate such that all except one can see the fruit.

I'll have a go...

One wall is a mirror. 30 people face the mirror, 1 person faces them with his back to the mirror. Place the pomegranate behind this person.
 
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  • #782
No mirrors and no smoke...
as its a silly one I will give it to you anyway.
:smile:
my answer was:
place it on the person's head...:-p
Now the more serious one:
Find the smallest palindromic number which is a perfect square and has an even number of digits.
EDIT: not writing a computer program would be appreciated...
 
  • #783
Enigman said:
EDIT: not writing a computer program would be appreciated...
Darn it.
 
  • #784
Enigman said:
Find the smallest palindromic number which is a perfect square and has an even number of digits.
Does it have to be palindromic in base ten?

[STRIKE]If not, then I'd say nine (binary: 1001), which is a perfect square of three (32 = 9, or if you prefer in binary, 11 × 11 = 1001), and has an even number of bits (does the term "digit" imply base ten? Hmm).[/STRIKE] Edit: Nevermind, see next post.
 
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  • #785
Enigman said:
Find the smallest palindromic number which is a perfect square and has an even number of digits.
My new guess is four (ternary 11). It is a perfect square of two, (ternary, 2 × 2 = 11), it is palindromic in base 3, and has an even number of digits in base 3.
 
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  • #786
Just base ten collinsmark...
(For a smallest number it doesn't seem really small enough...
6 digits
)
 
  • #787
collinsmark said:
Darn it.

Btw collinsmark I did solved it with C++... the clause was just so that I could see if someone's able to solve without programming...I couldn't.
:blushing:
 
  • #788
Enigman said:
Btw collinsmark I did solved it with C++... the clause was just so that I could see if someone's able to solve without programming...I couldn't.
:blushing:

Nor could I in base 10. Well, not without incrementally checking numbers manually. Computers are better at stuff like that.

Code:
using System;

// This is a C# program that finds the
// smallest perfect square that
// is palindromic in base 10,
// and has an even number of
// digits in base 10.
namespace Enigman_Palindrome_thing
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = 2; // This is the root of the perfect square.
            
            // Now let's loop through the natural numbers to find
            // the palindromic, even digited, perfect square.
            bool foundIt = false;
            while(!foundIt)
            {
                int nSquared = n * n; // this is the number to check.
                string nSquaredString = nSquared.ToString(); // string form.

                // Let the console know which number we're checking.
                Console.WriteLine("Currently checking " + nSquaredString);

                // check if it has even number of digits. 
                if((nSquaredString.Length)%2 == 0)
                {
                    // If we're here it's even. Check if it's a palindrome.
                    bool palindromeFlag = true;
                    for(int i = 0; i<nSquaredString.Length/2; i++)
                    {
                        // If symetric characters are not equal, 
                        // then it's not a palindrome.
                        if (!(nSquaredString[i] 
                            == nSquaredString[nSquaredString.Length - 1 - i]))
                            palindromeFlag = false;
                    }
                    if(palindromeFlag)
                    {
                        // Found it! let's report it to screen
                        // and finish up. 
                        foundIt = true;
                        Console.WriteLine(Environment.NewLine
                            + "Found it! The number is "
                            + nSquaredString + " which is "
                            + n.ToString() + " squared.");
                    }
                }
                // Increment n for next number to check.
                n++;
            }
            // Keep console alive until ready to leave.
            Console.ReadKey();

            // Goodbye!
        }
    }
}
 
  • #789
Okay, you probably missed giving the final answer amidst copying your code so:
836^2=698698
 
  • #790
There are eight oranges in a box. How can you divide them between eight people so that each person gets one orange, and one orange is still left in the box?
The oranges must not be peeled or cut.
 
  • #791
Enigman said:
Okay, you probably missed giving the final answer amidst copying your code so:
836^2=698698

Or more correctly ...
836^2=698896

I see (from a one-line REXX program) that the next one has 12 digits, but I didn't have the patience to find the third one!
 
  • #792
Enigman said:
There are eight oranges in a box. How can you divide them between eight people so that each person gets one orange, and one orange is still left in the box?
The oranges must not be peeled or cut.

Is it OK if one person gets a box as well, then?

(Edited to use spoiler tags - I thought I was just asking for clarification of the question!).
 
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  • #793
Jonathan Scott said:
Is it OK if one person gets a box as well, then?

Done!
Oh, and spoiler it. :wink:
 
  • #794
What is the maximum number of kings that can be placed on a chess board so that none of them threatens any other?
EDIT: A better way to put it would be maximum number of independent kings...
 
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  • #795
Is that so that they all can't move as moving each King would place itself into check, or that they are positioned in a way that there is a concievable pattern of movements such that all kings could make movements which would ultimately lead to a draw?
 
  • #796
Travis_King said:
Is that so that they all can't move as moving each King would place itself into check, or that they are positioned in a way that there is a concievable pattern of movements such that all kings could make movements which would ultimately lead to a draw?

The only condition is that the largest number of (independent ie. each of a different player or colour) kings should be on board without any king being in 'check' in the arrangement. So, the former follows from the conditions.
See- https://www.physicsforums.com/showpost.php?p=4575363&postcount=754 (same thing with knights)
This one too is a variation of the 8 queen puzzle. (Find an orientation such that there are 8 queens on board without being threatened ('checked') by any other)

A more mathematical restatement would be- in 8x8 square place maximum number of pieces so that there is always more than (or equal to) 1 unit^2 space between two pieces. or something like that...
 
  • #797
Enigman said:
What is the maximum number of kings that can be placed on a chess board so that none of them threatens any other?
EDIT: A better way to put it would be maximum number of independent kings...
By trial and error only:
16?
 
  • #798
Last edited:
  • #799
(I deleted the previous one posted here on grounds of being too silly)
If it takes four men eight days to dig four holes, how long does it
take one man to dig half a hole?
 
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  • #800
Enigman said:
(I deleted the previous one posted here on grounds of being too silly)
If it takes four men eight days to dig four holes, how long does it
take one man to dig half a hole?

I find the concept of "half a hole" rather difficult.

Is this meant to be a trivial maths question where the holes are assumed to require a fixed amount of work and "half a hole" means half the amount of work?
 
  • #801
The problem statement is all you get.
:biggrin:
(Okay, a leetle bit of advice: Do not stay in the box, stay and your fate's as uncertain as the cat's and I do love killing that particular variety of cat...I am a curious person)
 
  • #802
I want to say that it's not possible to dig half a hole. Once you break dirt you've got yourself a whole hole!
 
  • #803
Travis_King said:
I want to say that it's not possible to dig half a hole. Once you break dirt you've got yourself a whole hole!

Well said!
 
  • #804
Here's a pretty easy one:

Two boys, Mikey and Jimmy are running a 100 meter foot-race. The first time they race Mikey beats Jimmy by 5 meters. To make things fair, the next time they race, Mikey stands 5 meters behind the starting line.

Assuming they each run just as fast as they did in the first race, does Jimmy win the second race?
 
  • #805
Do we also assume they each run just as far as in the first race? :P
 
  • #806
Enigman said:
What is the maximum number of kings that can be placed on a chess board so that none of them threatens any other?

64, if they are all black or all white :biggrin:
 
  • #807
AlephZero said:
64, if they are all black or all white :biggrin:

Enigman said:
EDIT: A better way to put it would be maximum number of independent kings...

Hence the edit :P
 
  • #808
AlephZero said:
64, if they are all black or all white :biggrin:
That's why I included 'independent' in the edit.
:smile:
Travis_King said:
Here's a pretty easy one:

Two boys, Mikey and Jimmy are running a 100 meter foot-race. The first time they race Mikey beats Jimmy by 5 meters. To make things fair, the next time they race, Mikey stands 5 meters behind the starting line.

Assuming they each run just as fast as they did in the first race, does Jimmy win the second race?

Let t be time taken by M
Vm-100/t velocity of M
Vj-95/t velocity of J
Now-
Tm=105/Vm
Tm=1.05t
Tj=100/Vj
Tj=1.053t
Tj>Tm
M wins
 
  • #809
CompuChip - yup, you sure can.

That's it Enigman
some basic algebra for everyone!

How about this one:

A cashier tells you that the candybar you are trying to purchase costs $1.50. You hand him thirty five-cents. How much change do you get back?
 
  • #810
...0?
 

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