Puzzle Definition and 618 Threads

Hi guys, Can you help me with this problem, please? :confused: ...H ...______ EJS)HWNR ...CFJL ...______ ...CHW where each letter is unique digit from 0 to 9 thank you!

Hello all, I've recently developed an obsession with the game Sudoku. As I seek to lern more about the puzzle game, my ramblings around the internet led me to the wikipedia page describing the mathematics of Sudoku. The portion of interest to me right now is...

Hi All Is there a solution to the following? y = x/ln(2x) ...solving for x.

I've read somewhere that a single photon is traveling backward and forward in time and that this is supposed to be every photon that exists? 1) Did I read that wrong? 2) Is this part of current science lore? 3) Is it just a proposed idea? May I just let you know why I am asking too...

P is a base ten positive integer of the form abababcb, such that (P-1) is a perfect square ; where a, b and c denote three different digits from 0 to 9, with a being nonzero. Determine all possible value(s) of P for which this is possible.

B is a positive 8-digit base ten integer of the form PQRSTUVW that contains precisely 8 distinct digits from 1 to 9, and satisfies all of the following conditions: (i) PQ is divisible by 2. (ii) PQR is divisible by 3. (iii) PQRS is divisible by 4. (iv) PQRST is divisible by 5. (v) PQRSTU...

P is a 8-digit base ten positive integer having the form ABCDEFGH that uses each of the nonzero digits from 1 to 8 exactly once, and satisfies all of these conditions: (i) AB is divisible by 8. (ii) BC is divisible by 7. (iii) CD is divisible by 6. (iv) DE is divisible by 5. (v) EF is...

I'm kind of lost on this one. Could someone please help me. Two equally big squares with the sides 12 cm partly covers each other as the figure shows. One of the squares corner is in the other squares center. Decide the area of the shadowed part...

Not homework but this is probably the best suited place for a puzzle: A large rectangle in the plane is partitioned into smaller rectangles, each of which has either integer height or integer width (or both). Prove that the large rectangle also has this property. I've given this several...

Please help in c++ urgent Argh! I've been trying to work out this problem for an entire week and I'm now at my wits end! I'm supposed to hand in this assignment in 7 hours and am posting my problem here as a last resort. Can i please have someone's assistance in this? I use Dev-C++. Basically...

Have fun. Key: 1134487964316 Lock1: 23144767481431 Lock2: 43148651671461 Lock3: 43517649819891 Lock4: 76487995462131 Lock5: 47687982498191 Lock6: 46149897275131 Lock7: 46768491794850

I posted this on another thread but no one has responded. It is truly a great puzzle to work out. So, I am posting it again in its own thread. Enjoy. The "Hardest Logical Puzzle Ever": Three gods, A, B, and C, are called True, False, and Random (in some order you do not know.) True...

Complex Engineering Puzzle! Distribute 20 lbs of pressure in 5 hours, the numbers Must be Odds and each hour must have a value; you can't use even numbers, nor frations, just positives completes! wich are the values??

Complex Mathematical Puzzle! Distribute 20 lbs of pressure in 5 hours, the numbers Must be Odds and each hour must have a value; you can't use even numbers, nor frations, just positives completes! wich are the values??

A "galilean puzzle" in electromagnetism Well, I still didn't managed to find the answer, since the puzzle seems a little bit more involved than I first tought...to perform the computations, you only need to know a little bit about lagrangian/hamiltonian dynamics in electromagnetism. Consider...

I am trying to solve this,,,need help...

Solve this cryptarithm, where PRE is a base 10 positive integer and EVER is a base 9 positive integer. Each of the letters represents a different digit, and none of P and E is zero. (PRE)10 = (EVER)9 + 1

I have a symmetry question in QM that's been puzzling me. To state the puzzle, I use a simplified example of a neutral pion in an otherwise empty universe. Since the pion is spinless, and since it possesses no electric or magnetic dipole (or higher) moments, this little set-up is spherically...

p, q and r are three positive integers satisfying p< q< r, such that q is the arithmetic mean of p and r. Determine all possible triplet(s) (p, q, r) that satisfy both the cryptarithmetic equations, where each of the capital letters denotes a different decimal digit from 0 to 9 and, none of T...

Hi, I am helping my children with a computer game based on Logic and Reasoning. The player has to solve different puzzles as the game progresses. I am struggling with a matching puzzle where the player has to form a string of the game characters based on their traits. Please see the attached...

Some of you may have heard this before, but its one of those classic problem that I love debating, so please weigh in if you think you have the answer... You have an S-shaped sprinkler, when water is run out of it the sprinkler rotates about its center axis in the opposite direction to the...

N is a seven digit base-8 positive integer having the form ABCDEFG that uses each of the nonzero base-8 digits 1 to 7 exactly once, and satisfies these conditions: (i) ABCDEFG is divisible by 7. (ii) ABCDEF is divisible by 6. (iii) ABCDE divisible by 5. (iv) ABCD is divisible by 4. (v)...

Determine the value of “PRINCE” and “FIVE”, given that “PRINCE” is a perfect cube and “FIVE” is a perfect square. Each of the letters denote a different decimal digit and none of P and F can be zero.

Homework Statement Natural carbon consists of two different isotopes (excluding 14C, which is present in only trace amounts). The isotopes have different masses, which is due to different numbers of neutrons in the nucleus; however, the number of protons in the same, and subsequently the...

Two consecutive positive decimal integers are such that the sum of the digits of each of them is divisible by 11. Determine the minimum possible pair of such numbers.

Determine all possible positive decimal integer(s) P = X1X2X3….Xn, where P>=2 with none of the digits in P being zero, that satisfy this equation: P = X1^X1 + X2^X2 + ……+ Xn^Xn (For example, P = 234 cannot be a solution since 2^2 + 3^3 + 4^4 is equal to 287, not 234.) Notes: (i)...

Homework Statement Hello Its a pretty tricky question ! Help me find the answer so i can finally sleep (i only get the answer when i hand in the question sheets in 3 weeks) :D ->>>> You walk for 1 hour, and do 5 miles during that hour Question : show that there exist a time...

I have a pretty broad question. I, with several others, am working on some stirling engines for a science fair of sorts. I have done enough research to understand the concept of how they work. I also understand that there are several different types; single cylinder, double cylinder etc. What I...

This ones a classic and it doesn't seem it's come up before. But draw 9 dots in 3 rows and columns that are equidistant, now join them up with not more than 4 straight lines. If you already know it be sure not to give the game away. Just a simple problem I thought might pass a few moments to...

I have practically zero physics background. I understand a lot, but have zero knowledge of any higher physics math. Anyway, in pondering what things I've read related to physics, I am left with a few questions that completely puzzle me.First C... the speed of light is considered a constant...

Homework Statement Are (d/dt)[f(x+t)] and f '(x+t) always equal? Homework Equations The Attempt at a Solution For (d/dt)[f(x+t)], I would interpret it as first evaluate at x+t, then differentiate with respect to t. And the standard interpretation of f '(x+t) is f '(x+t) = (d[f(x)]/dx)...

numbers puzzle... Mr X catches 7000 fish appox from a sea.When he lines up the fish in rows of 9 three remain. These three fish are thrown.He then lines up the remaining fish in rows of 10.THis time two fish remain and again they are thrown in the sea.Finally he lines up the remaining fish in...

Well I have the answer already, just don't understand it. A rectangular coil of wire is hung from one arm of a balance, as my beautiful diagram will show. With the magnetic turned off, a Mass M is added to the pan on the other arm to balance the weight of the coil. When a constant magnetic...

What is the radius of the largest circle that you can fit in one quadrant of a bigger of radius 1?

As an interested hobbyist only, I have mainly been trying to understand some of the key ideas that underpin modern cosmology. While I may have made some `relative` progress, there are a number of really basic issues that still puzzle me. As it’s the New Year, I thought I start by trying to clear...

What three digit prime number has all prime digits and forms primes with its first two and last two digits?

Hey guys, so I missed like the last week of classes due to me being sick all the time but I got a homework problem that I am pretty sure I would have learned if I were in class last week but here it is: The area of the continental United States is approximately 3.5 x 10^6 mi^2, and its...

Homework Statement Here is an image of the problem (Write the circuit in min SOP form.) http://img211.imageshack.us/my.php?image=ddtl0.jpg Homework Equations The Attempt at a Solution I've looked at it and gone over notes but I don't get it. If you would like I can scan my...

Hi! I want to determine which of the subgropus of the symmetric group S(3) are normal. The condition is: for every g in G: g H g^-1 = H where H is a subgroup of G. I have determined all the subgroups of S(3) and I came up with 13. What I did after that is I considered 2 cases...

Homework Statement The string in a yo-yo is wound around an axle of radius 0.512 cm. The yo-yo has both rotational and translational motion, like a rolling object, and has mass 0.206 kg and outer radius 1.88 cm. Starting from rest, it rotates and falls a distance of 1.20 m (the length of the...

Here is a probability question I came across recently: If the chance of being hit by a car while crossing the street is 0.1, then what are the chances of being hit by a car after crossing the street 10 times? Obviously the probability can't be 100% (the sum of the individual...

This is a repost of an old thread, maybe some new members can give it a shot. This puzzle was included at the start of a casual IBM Fortran programming class for high school students back in 1969. (Yes, I'm that old). I don't know the origin of this puzzle. An extremely simple and old...

Two balls are thrown in the air at different angles, but each reaches the same height. Which ball remains in the air longer? a the one thrown at the steeper angle b the one thrown at a shallower angle c both remain in the air the same time d need more information I'm...

Chadwick worked as personal secretary to Forbisher. He was given a list to type up that Forbisher was to submit to the London Telegraph puzzle editor within the hour because he was certain he had solved the puzzle. However Chadwick carelessly dropped a cigarette on the paper before he had a...

factoring "puzzle" For what values of "a" can the following be factored and reduced: \frac {a^2 - 2x -3}{x^2 - 4x + a} Ok, so the first thing on the list is to factor the top term. x = \frac {-(-2) \pm \sqrt{(-2)^2 - 4 * 1 * (-3)} } {2 * 1} The roots are 3 & -1, and the factors then...

we mix one spoon of salt and one spoon of pepper together and mix them how to separate them without touching the mixed salt and pepper no physical touching aloud

A positive 3-digit decimal (base 10) number is such that if we divide the number by 3, reverse the digits of the result, and then subtract 1, we will obtain the original number. Determine the number. What is the next greater number (possibly with more than 3 digits) with this property?

1) Three frogs are placed on three vertices of a square. Every minute, one frog leaps over another frog, in such a way that the "leapee" is at the midpoint of the line segment whose endpoints are the starting and ending position of the "leaper." Will a frog ever occupy the vertex of the square...

A positive decimal (base 10) integer G is called an ascending number if the number of digits in G is at least 2, all the digits of G are strictly ascending, and G does not contain any leading zeroes. For example, the number 1236789 is an ascending number. However, the number 1222333555666...

You're in a room with three switches that open three lightbulbs in a separate room. You don't know which switch turns on which lightbulb. How do you find out which switch goes to which lightbulb by entering the other room only once? You don't have any help, you can't see the other room while you...