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#22103 - 10/14/03 09:36 PM Re: Use your brain!
twopecker Offline
local

Registered: 07/20/03
Posts: 290
Loc: Nebraska
Now you got me thinking of a riddle I saw on a website a while ago, and could not figure out:

I have two dozen doors that lead to nowhere.

answer?

any guesses?

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#22104 - 10/15/03 12:41 AM Re: Use your brain!
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16437
Loc: Ben Lomond, California
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I can explain it to you but I can't understand it for you.

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#22105 - 10/15/03 01:37 AM Re: Use your brain!
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10623
Doors themselves never lead anywhere; doorways do.
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Enjoy the music, not the equipment.



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#22106 - 10/15/03 08:50 AM Re: Use your brain!
OGS20 Offline
old hand

Registered: 08/23/02
Posts: 65
Loc: TO
Blimey, I'm stumped (Doesn't take much anyways ...)

You've got a solution to this one? Or does someone just says there is one? I imagine you separate the balls into 3 groups and you have to mix and match them for the 2nd and 3rd weighings but can't get the math to work ....

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#22107 - 10/15/03 08:17 PM Re: Use your brain!
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16437
Loc: Ben Lomond, California
I have the solution! (Ok, so I found it. ) Lemme know when you want it.

The secret lies in assigning each ball a unique "code" made up of the 3 positions that it can occupy during each use of the scale: left, right, or set aside.
_________________________
I can explain it to you but I can't understand it for you.

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#22108 - 10/16/03 08:49 AM Re: Use your brain!
OGS20 Offline
old hand

Registered: 08/23/02
Posts: 65
Loc: TO
Yeah, I did that -- 3 groups each (A, B, C) and each ball is numbered (A1, A2 .... C3, C4).

You weigh 2 groups first and leave one group off, then the second time you mix and match all 12 balls (hence the numbering). Right? Well at least I'm on the right track, right ...

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#22109 - 10/16/03 11:12 PM Re: Use your brain!
Zarak Offline
connoisseur

Registered: 03/09/03
Posts: 1852
Loc: PA
Here's a new one, I'm not sure if it's solvable...if it is I've never been able to figure it out. Take a piece of paper and draw 3 houses (a square with a triangle on top of it). Then put the letters G, O, and W on the paper. These stand for Gas, Oil, and Water. Draw a line from the gas to each house, oil to each, and water to each. The catch is, the lines from different sources cannot cross each other. I'd post a picture but don't have a web server to do it from. I'd love to know the solution if anyone can figure it out and post a picture of the solution, or a proof that it can't be solved if it can't.

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#22110 - 10/16/03 11:55 PM Re: Use your brain!
Saturn Offline
connoisseur

Registered: 10/21/02
Posts: 1041
Loc: Toronto Ontario Canuck

The only criteria is that you can not cross different sources. Gas is crossing itself.
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#22111 - 10/17/03 08:29 AM Re: Use your brain!
Zarak Offline
connoisseur

Registered: 03/09/03
Posts: 1852
Loc: PA
That's the closest I have come. I'm looking for a way to do it where you can't run lines through the houses like you did with Gas.

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#22112 - 10/17/03 10:12 AM Re: Use your brain!
JasonG Offline
local

Registered: 04/29/02
Posts: 216
Loc: central Ohio
Oil?

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