All Activityhttp://brainden.com/forum/discover/BrainDen.com - Brain Teasers - All Activityen<link><![CDATA[http://brainden.com/forum/topic/11460--/?do=findComment&comment=350376]]></link><description>For a given NxN square there are N diagonals, starting with N in the top right corner. Each number in the sequence is below and one to the left of the previous number. So it is N - 1 more than the previous number. For a given N this forms an arithmetic progression with d = N -1.
So S = (n/2) (2a + (n-1)d)
where S = 5335, n = N, a = N, d = N - 1
Substitute in and arrange to get:
N3 + N = 10670
Solve for N and find N2 for the bottom right entry.
This equation is a depressed cubic (no N2 term) and can be solved by the Cardano method ( http://www.sosmath.com/algebra/factor/fac11/fac11.html ) to give N = 22.
Alternatively, note that, for N much greater than 10, N is less than 1% of N3 and can be ignored.
This gives N3 ~ 10670
N ~ 22
So the bottom right entry is 222 = 484</description><pubDate>Sat, 04 Jul 2020 13:17:02 +0000</pubDate></item><item><title>WIL AIME FORTH RIDDLESince you mentioned France, pyramid makes me think of the Louvre. Not a clue what to do with those times though. It's well past May 11th. Do you have the answer?Thu, 02 Jul 2020 06:54:43 +0000Who lies and who tells the truth?Drummer : Mix
Juggler : Mix
Jester : Truth
Bear : Mix
Piper : LiarThu, 02 Jul 2020 03:30:13 +0000IQ test questionNamdevvikas2@gmail.com
BIUThu, 02 Jul 2020 03:00:17 +0000RIDDLEWed, 01 Jul 2020 17:13:16 +0000quiz 8.jpghttp://brainden.com/forum/gallery/image/196-quiz-8jpg/Wed, 01 Jul 2020 17:11:12 +0000Puzzle with banknotesMon, 29 Jun 2020 05:53:37 +0000Who lies and who tells the truth?This is a puzzle from an Usborne puzzle books called Logic Puzzles, and though it gives the correct answer, the method for how it reaches that answer eludes me. I’m posting it here to see if anyone can explain the logical steps to reach the answer (I’ll refrain from posting the answer for now if people with to try and solve it. The puzzle goes as follows:
There is a troupe of five mummers: a drummer, a dancing bear, a piper, a juggler, and a jester. One always tells the truth, one always tells lies, and the remaining three tell a mixture of truth and lies. To find out who tells what, the following clues are presented:
Drummer: I always tell a mixture of truth and lies.
Juggler: That is not true.
Jester: If the bear is always truthful, the juggler tells nothing but lies.
Bear: That is false.
Piper: The drummer always tells the truth.
Jester: The piper tells nothing but lies.
Can you figure out who tells what based on this information, and how?Mon, 29 Jun 2020 01:39:40 +0000Puzzle with banknotesAnd what about this:Sun, 28 Jun 2020 22:23:54 +0000Puzzle with banknotesI think I have a much better answer.
01: 100 pay 3 with 100
02: 50 20 20 10 5 2 pay 3 with 5
03: 50 20 20 10 2 1 1
@harey Rule 3 in the puzzle stipulated
"..........always gives the nearest bank note (of which he had at the moment)....".
You have broken this rule at shop 02, by tendering a note of denomination 50. You MUST have tendered note of denomination 20 intead!!Thu, 25 Jun 2020 05:49:37 +0000<link><![CDATA[http://brainden.com/forum/topic/901--/?do=findComment&comment=350360]]></link><description>They both leave on day 2. The first day each one sees the other doesn’t leave, which proves he himself has a tattoo. Then the next day they both leave.</description><pubDate>Wed, 24 Jun 2020 07:50:13 +0000</pubDate></item><item><title>Can you please solveFor interest's sake, if no true fractions were involved at all, there is an alternative solution ...Sat, 20 Jun 2020 14:58:52 +0000Can you please solveFri, 19 Jun 2020 19:30:45 +0000A Bored RiddleCorrect answer?
Correct answer?Fri, 19 Jun 2020 15:55:48 +0000Can you please solveFri, 19 Jun 2020 12:43:43 +0000Groundhog in a Hole - Yet AgainWed, 17 Jun 2020 19:43:21 +0000Solve for ?I assume a is 1/4 of x (?). It means that x^2 = 4*95=380.
x= square root of 380Wed, 17 Jun 2020 02:32:28 +0000Emoji based math puzzle - level easy!I think that the ans. is 39 because the blink eye emoji is of 10, the heart eye emoji is of 7, and the purple emoji is of 5 think about it
114 is the correct ans sorry because i plus in last instead of multipling the digitsTue, 16 Jun 2020 09:07:18 +0000Solve for ?? =19Thu, 11 Jun 2020 22:59:10 +0000RiddleRocketHello i‘m RiddleRocket and i‘m currently setting up a youtube account. I‘m thanksfull for any suggestions forimpovement! And very Happy about every subscriber!
https://youtu.be/eJ2J88X9bFkWed, 10 Jun 2020 20:15:08 +0000Solve for ?Wed, 10 Jun 2020 11:28:47 +0000Groundhog in a Hole - Yet AgainWhile the hole that the groundhog starts in is unknown, it is one specific hole and its movements are as described. No matter what hole it starts in, given its described movement, the strategy given will eventually find it. You make it seem like the groundhog can teleport just because it's starting hole was unknown.
Given your "about 17 holes outside" example, it would take just one or two (depending on parity) rounds of area clearing/expansion to get it. It does not matter that there are more holes outside the area, it will eventually be trapped and caught.Tue, 09 Jun 2020 13:43:18 +0000Groundhog in a Hole - Yet AgainTue, 09 Jun 2020 00:10:37 +0000Two boys problemOhhh... I get what you mean now. So it was a language barrier. Thanks a lot for a clarification!Sun, 07 Jun 2020 04:50:23 +000010201 poker cases and 2 scalesThe kitchen scale: I’m trying to understand the 2g precision. Does that mean that if Ng is placed on it, it will display any number from N-1 to N+1 inclusive? Or N-2 through N+2? Or something else?Sun, 07 Jun 2020 01:17:54 +0000