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Riddles
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Neil
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Neil
Re: Riddles
« on: April 28, 2008, 07:49 PM »
Quote from: Yamor on April 28, 2008, 07:36 PM
Nice quick deleting, neil! Don't say i'm wrong so quickly next time!
Well I'm still trying to check I think the 8 can be married to the 7 and so on, but it screws up as you can't find the 3, 2 ,1 and 0. So fair enough.
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Yamor
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Re: Riddles
« on: April 28, 2008, 07:57 PM »
To put it simply: if 8 is married to 7, there are 3/10 people he couldn't shake hands with  himself, his wife, and the guy who said zero. The only way that he could have shaked hands with 8/10 people is if the zero IS his wife!
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Yamor
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Re: Riddles
« on: April 28, 2008, 08:18 PM »
What about this one  probably the most difficult riddle so far. It has two parts:
There is a circular table, with 24 seats, each seat has a place card, but the 24 people come in and sit randomly. It turns out that no one is seated correctly. Is it always possible to rotate the table until at least two people are in their right places?
What about if it turns out that one person sat on his right place, will it always be possible to rotate until at least two are in the right place?
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Neil
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Re: Riddles
« on: April 28, 2008, 10:12 PM »
Quote from: Yamor on April 28, 2008, 08:18 PM
What about this one  probably the most difficult riddle so far. It has two parts:
There is a circular table, with 24 seats, each seat has a place card, but the 24 people come in and sit randomly. It turns out that no one is seated correctly. Is it always possible to rotate the table until at least two people are in their right places?
What about if it turns out that one person sat on his right place, will it always be possible to rotate until at least two are in the right place?
Not really a riddle in the traditional sense. It's not like there's trick or knack to it. Surely it's just working it out.
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Yamor
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Re: Riddles
« on: April 28, 2008, 10:19 PM »
There is a trick to it, but you're right, its not a riddle in the sense of a simple answer. I'm asking straight for the reasoning here. But its a good one.
The reason why i like the last one so much (and it really applies to this one as well), is because it really feels like there's not enough information. Also, the reasoning is beautiful, really!
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Re: Riddles
« on: April 28, 2008, 10:21 PM »
Quote from: Quackers on April 28, 2008, 10:13 PM
This topic is called "Riddles" not "Mathematical boll**ks".
if you look at any book of riddles worth its salt, it will have a sizeable section of mathematical riddles. A mathematical riddle is the purest sort of riddle really. But its your topic, so, whatever...
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Yamor
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Re: Riddles
« on: April 28, 2008, 10:28 PM »
You're right, its not mathematical as in the sort of maths you're taught in school, but its the sort of riddle which would be called mathematical, or at least a riddle which is attractive to mathematically minded people.
My first riddle is even more mathematical.
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Re: Riddles
« on: April 28, 2008, 10:37 PM »
Actually the riddle in question was published by one of the greatest riddle creators of all time (his name has actually escaped my memory, but i remember he was an american, and i think he had a column in (i think) Scientific American with riddles), so i wouldn't say its so bad.
Just because someone does not like a certain genre of riddles, does not mean it isn't a riddle, as is the case with almost anything, like novels, films, music etc.
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Re: Riddles
« on: April 28, 2008, 10:39 PM »
And now that i'm thinking about it, the riddle in this thread which is most purely mathematical was your riddle!
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Re: Riddles
« on: April 28, 2008, 10:47 PM »
But why is it maths? Since when is dealing in numbers so mathematical? Sudoku isn't mathematical! Your riddle was a simple algebraic puzzle.
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Neil
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Re: Riddles
« on: April 28, 2008, 10:48 PM »
Sudoku is mathmatical..... by definition, anything with numbers is mathematical. That's a ludicrous statement.
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Re: Riddles
« on: April 28, 2008, 10:51 PM »
I don't agree. As much as you play sudoku with 19, you could play it with the letters ai. What makes it mathematical?
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Re: Riddles
« on: April 28, 2008, 10:52 PM »
Your riddle was algebraic. You probably worked it out with trialanderror, which makes the whole riddle a waste of time, imo.
And this is stupid. Sudoku is definitely not mathematical!
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Neil
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Re: Riddles
« on: April 28, 2008, 10:53 PM »
Reminder of Riddles
Easy
1) When asked how old she was, Mary replied:
‘In two years, I will be twice as old as I was five years ago’
How old is she?
2) A black dog is sleeping in the middle of a black road that has no streetlights and there is no moon. A car coming down the road with its lights off steers around the dog. How did the driver know the dog was there?
3) In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly. The Question: How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly?
Medium
1) My wife and I recently attended a party at which there were four other married couples. Various handshakes took place. No one shook hands with himself (or herself) or with his (or her) spouse, and no one shook hands with the anyone more then once.
After all the handshakes were over, I asked each person, including my wife, how many hands he (or she) had shaken. To my suprise each gave a different answer. How many hands did my wife shake?
Hard
1) A man enters a hotel with a thousand rooms, numbered from 1 to 1000, and goes round opening all the doors (1000 doors). He then closes the doors of every second room (that is, room nos. 2, 4, 6 etc.). Then he goes to every third room and if he finds it open he closes it and if he finds it closed he opens it. Then every fourth room, then every fifth etc. etc., until every thousandth room. (of course, from after he does every 500th room, he's only doing one door each round!)
The question is, how many doors are left open at the end?
Very Hard
2) There is a circular table, with 24 seats, each seat has a place card, but the 24 people come in and sit randomly. It turns out that no one is seated correctly. Is it always possible to rotate the table until at least two people are in their right places?
What about if it turns out that one person sat on his right place, will it always be possible to rotate until at least two are in the right place?
Answers in spoilers please!
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Yamor
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Re: Riddles
« on: April 28, 2008, 10:54 PM »
Quote from: Quackers on April 28, 2008, 10:52 PM
Well, as basic as it may sound to you, you use this skill called counting and it goes allllllll the way up to nine
when do you count when you sudoku?
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