User contributions for Oscarlevin

12 April 2010

• 18:5918:59, 12 April 2010 diff hist +632‎ N Seven elevators ‎ Created page with 'The superintendent of an apartment building tells you that his building has seven elevators. Each elevator stops on at most 6 floors. He also tells you that you can get to any o…'
• 18:5118:51, 12 April 2010 diff hist +586‎ N Knight vs. dragon ‎ Created page with 'A dragon and knight live on an island. This island has seven poisoned wells, numbered 1 to 7. If you drink from a well, you can only save yourself by drinking from a higher numbe…'
• 17:2917:29, 12 April 2010 diff hist +929‎ N Chests of logic ‎ Created page with 'You are an archaeologist that has just unearthed a long sought pair of ancient treasure chests. One chest is plated with silver, and the other is plated with gold. According to l…'
• 17:2117:21, 12 April 2010 diff hist +556‎ N Multiple locks ‎ Created page with 'You belong to a club that has accumulated valuable jewelry. The treasure is kept in a chest. For security reasons, you want at least two of your 10 club members present when the …'
• 17:1817:18, 12 April 2010 diff hist +877‎ N Three sons ‎ Created page with 'On sunny afternoon in September, Richard and Katie were chatting over coffee, after not seeing each other in many years. "Do you have any children?" asked Katie? "Yes. I have …'
• 17:1217:12, 12 April 2010 diff hist +267‎ N True or false ‎ Created page with 'Assign a truth value to each of the following statements. # Statement 5 is false. # Statement 1 is false. # Statement 4 is true. # Only one of these statements is false. # Statem…'
• 17:1017:10, 12 April 2010 diff hist +138‎ N Two EGGs ‎ Created page with 'Solve this cryptarithmetic problem: EGG + EGG = PAGE. (Each letter represents a unique digit from 0 to 9.) Category: Cryptarithmetic'
• 17:0717:07, 12 April 2010 diff hist −1‎ Splitting ten ‎No edit summary
• 17:0617:06, 12 April 2010 diff hist +80‎ N Template:Needs math ‎ Created page with '==Mathematics== Coming soon! Category: Needs math Category: Needs work'
• 17:0517:05, 12 April 2010 diff hist +52‎ N Template:Needs answer ‎ Created page with '==Solution== Coming soon! Category: Unanswered'
• 17:0517:05, 12 April 2010 diff hist +282‎ N Splitting ten ‎ Created page with 'Ten people are sitting around a round table. The sum of ten dollars is to be distributed among them according to the rule that each person receives one half of the sum that his t…'
• 17:0217:02, 12 April 2010 diff hist +79‎ N Times of day ‎ Created page with 'How many times a day do the digits on a digital clock add to 22? At what times?'
• 12:2812:28, 12 April 2010 diff hist +32‎ Next letter ‎ →‎Puzzle
• 12:2712:27, 12 April 2010 diff hist +69‎ N Next letter ‎ Created page with '==Puzzle== What is the next letter in the sequence: O T T F F S S E.'
• 11:4211:42, 12 April 2010 diff hist +28‎ Seven orbs ‎No edit summary
• 11:3711:37, 12 April 2010 diff hist −47‎ Meta:Main Page ‎No edit summary
• 11:3611:36, 12 April 2010 diff hist +4‎ Meta:Main Page ‎No edit summary
• 11:2711:27, 12 April 2010 diff hist −1‎ Meta:Main Page ‎No edit summary
• 11:2711:27, 12 April 2010 diff hist −231‎ Meta:Main Page ‎No edit summary

9 April 2010

• 20:1920:19, 9 April 2010 diff hist +538‎ N Fuses ‎ Created page with 'A very nice puzzle from PProblem SSSolving. ==Puzzle== You have two fuses, each twelve inches long. Each fuse burns in exactly one hour, but does not necessarily burn at a unif…'

8 April 2010

• 11:5211:52, 8 April 2010 diff hist +26‎ Template:Needs work ‎No edit summary
• 11:5011:50, 8 April 2010 diff hist +12‎ N Template:Needs work ‎ Created page with 'Coming soon!'
• 11:4911:49, 8 April 2010 diff hist +71‎ N Green eyed dragons ‎ Created page with '==Puzzle== {{needs work}} Category: Induction Category: Logic'
• 11:4411:44, 8 April 2010 diff hist +1,036‎ N Milk and coffee ‎ Created page with 'This simple thought experiment is has surprising result. The variation is a good activity for students to try to get a handle on the problem. ==Puzzle== An 8-ounce cup of coff…'
• 11:3611:36, 8 April 2010 diff hist +1,007‎ N Forty thieves ‎ Created page with 'Here is an easier version of the Five pirates puzzle. ==Puzzle== Forty thieves, all of different ages, steal a huge pile of identical gold coins. For whatever reason, they …'
• 11:3311:33, 8 April 2010 diff hist +552‎ N Commuter ‎ Created page with '==Puzzle== A commuter rides the train to and from work each day. Her husband meets her at the train station and drives her home. One day the commuter leaves work early, catches …'
• 11:1411:14, 8 April 2010 diff hist +668‎ N Two guards ‎ Created page with 'Here is the classic puzzle of the two guards, one a liar and one honest. As seen in Labyrinth, Doctor Who, and elsewhere. ==Puzzle== You are in a dungeon (trying to get out, o…'

7 April 2010

• 20:1020:10, 7 April 2010 diff hist +564‎ N Failed exams ‎ Created page with 'Here is a typical set theory problem ==Puzzle== An examination in three subjects, Algebra, Biology, and Chemistry, was taken by 41 students. The following table shows how many …'
• 19:5719:57, 7 April 2010 diff hist +1,200‎ N Prom problem ‎ Created page with 'A nice, medium difficulty logic puzzle as appears in PProblem SSSolving. ==Puzzle== After the senior prom, six friends went to their favorite restaurant, where they shared a bo…'
• 17:3817:38, 7 April 2010 diff hist +551‎ N Blank dice ‎ Created page with 'Here is a probability brain teaser that I remember from a math for elementary ed class I tutored. ==Puzzle== When you roll two six sided fair dice and add the dots displayed,…'
• 17:2817:28, 7 April 2010 diff hist +562‎ N Light bulb ‎ Created page with 'Here is a classic lateral thinking puzzle. ==Puzzle== A very strange house has a single light bulb connected in the basement. The switch for this light is located on the top f…'
• 17:2217:22, 7 April 2010 diff hist 0‎ Earings ‎ →‎Puzzle
• 17:2117:21, 7 April 2010 diff hist +174‎ N Earings ‎ Created page with '==Puzzle== In a village of 800 women, 3% wear one earing. Of the remaining 97%, half wear two earrings and half wear none. How many earrings are worn? Category: Algebra'
• 14:5914:59, 7 April 2010 diff hist +25,497‎ N MediaWiki:Common.css ‎ Created page with '→‎CSS placed here will be applied to all skins: →‎<source lang="css">: →‎Main page fixes: #interwiki-completelist { font-weight: bold; } body.page-Main_Page #ca-de…'
• 14:2614:26, 7 April 2010 diff hist +628‎ N Ten bags of gold ‎ Created page with 'Here is a weighing puzzle I remember from Mind-quest. ==Puzzle== You have ten bags filled with ten gold coins each -- or so you thought. A mysterious note arrives informing yo…'
• 14:1614:16, 7 April 2010 diff hist +699‎ N Six weights ‎ Created page with 'A nice variation of the classic balance scale weighing puzzle. First saw this in PProblem SSSolving. ==Puzzle== You have six weights. One pair is red, one pair is white, one p…'
• 12:5112:51, 7 April 2010 diff hist +1‎ Twelve weights ‎ →‎See also
• 12:5112:51, 7 April 2010 diff hist +1,069‎ N Twelve weights ‎ Created page with 'A classic weighing problem, much harder than the similar Nine weights puzzle. ==Puzzle== Each year at the Fairytale Fair, a contest is held to see which goose can lay a gol…'

5 April 2010

• 17:1817:18, 5 April 2010 diff hist +98‎ N Talk:Around the world ‎ Created page with 'I think Will D. told me this puzzle. At some point I should email him to get the correct version.'
• 17:1717:17, 5 April 2010 diff hist +419‎ N Around the world ‎ Created page with 'This is a nice optimization problem. ==Puzzle== It goes something like this: you must fly around the world in a plane, but it does not hold enough gas to get you there (how muc…'
• 09:0309:03, 5 April 2010 diff hist +242‎ Three couples ‎No edit summary
• 09:0109:01, 5 April 2010 diff hist +698‎ N Three couples ‎ Created page with 'Here is a crossing puzzle similar to Cannibals and missionaries. I first saw this in Averbach and Chein. ==Puzzle== Three couples are on a safari, when they come to a rive…'
• 07:1007:10, 5 April 2010 diff hist +241‎ Nine weights ‎ →‎Puzzle
• 07:0607:06, 5 April 2010 diff hist +685‎ N Nine weights ‎ Created page with 'A classic logic puzzle. ==Puzzle== On the table sit nine identical looking nuggets of gold. However, you know that one of the nine is a clever forgery. The only difference be…'
• 06:5506:55, 5 April 2010 diff hist +2‎ Friends at a party ‎ →‎Puzzle

3 April 2010

• 10:3010:30, 3 April 2010 diff hist +1,633‎ N Ball drop ‎ Created page with 'Here is a nice optimization puzzle from the [http://www.mathsisfun.com: Maths is Fun] website. ==Puzzle== Pool and Billiard mega store Balls-R-Us wants to shoot a commercial fo…'

2 April 2010

• 08:3608:36, 2 April 2010 diff hist +703‎ N Five pirates ‎ Created page with 'Here is a considerably harder version of the Forty thieves puzzle. ==The puzzle== Five bloodthirsty pirates have just procured 100 gold pieces, which they must now divide …'

30 March 2010

• 13:1013:10, 30 March 2010 diff hist +65‎ N Talk:Houses and utilities ‎ Created page with 'This should be put into a nicer story, and should have a graphic.'
• 13:1013:10, 30 March 2010 diff hist +166‎ N Houses and utilities ‎ Created page with '==Puzzle== Is it possible to connect each of three houses to each of three utilities without any of the lines crossing? (NEEDS PICTURE) Category: Graph theory'
• 13:0713:07, 30 March 2010 diff hist +286‎ N Friends or non-friends ‎ Created page with '==Puzzle== If there are six people in a room, must there be at least three of them who are either all friends with each other or all non-friends with each other? (If A is frien…'