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#22093 - 10/14/03 02:55 PM Use your brain!
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16268
Loc: Leesburg, Virginia
No, that's not an insult. I thought some people here might like a place that challenges the brain in a different way. So this will be the riddle / brain teaser thread. (This may flop completely, but it's worth a try. I know at least I love riddles. )

I'll start it off with one of my favorites.

You have 12 similar looking balls. 11 of them weight the same. One of them is slightly heavier than the others. You also have a scale. You can put balls on both sides of the scale and it'll tell you which side is heavier or will stay in the middle if both sides weight the same. Here's the kicker: You can only use the scale 3 times. How can you find the one ball that is heavier?
_________________________
"I wish I had documented more…" said nobody on their death bed, ever.

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#22094 - 10/14/03 03:03 PM Re: Use your brain!
OGS20 Offline
old hand

Registered: 08/23/02
Posts: 65
Loc: TO
Put 6 balls on each side. One side will be heavier.

Take the 6 balls from the heavier side, split them into 3 each, and put them on different sides. One side will be heavier.

With the 3 balls from the heaiver side remaining, take TWO, put 1 on each side. If one side/ball is heavier, then that's the one. If they both weigh the same, then the third ball is the heavier one.



Give me another one, I'm bored at work

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#22095 - 10/14/03 03:53 PM Re: Use your brain!
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16268
Loc: Leesburg, Virginia
You can also start with 5 balls on each side, leaving 2 aside to measure if the others weigh the same.

Ok then. Here's the same riddle with a nasty twist:

You have 12 similar looking balls. 11 of them weigh the same. One of them has a slightly different weight, BUT you don't know whether it is heavier or lighter. You also have a scale. You can put balls on both sides of the scale and it'll tell you which side is heavier or will stay in the middle if both sides weight the same. Again, you can use the scale only three times. How can you find out whether the different ball is lighter or heavier and which one it is?

(I haven't been able to figure this one out, but it is solvable as far as I know.)
_________________________
"I wish I had documented more…" said nobody on their death bed, ever.

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#22096 - 10/14/03 06:05 PM Re: Use your brain!
sushi Offline
connoisseur

Registered: 02/09/03
Posts: 1490
Loc: Dallas, TX
Umm... I give up on the second version!!! Are you sure it's solvable?


Okay, here is my favorite:

There are two rooms next to each other: one with three switches, the other with three light bulbs. Each one of these switches turns on/off one corresponding light bulb in the other room. You can come in to each room only once, manipulating/observing the switches and light bulbs. How do you determine which switch is connected to which light bulb?

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#22097 - 10/14/03 06:30 PM Re: Use your brain!
Zarak Offline
connoisseur

Registered: 03/09/03
Posts: 1849
Loc: PA
I know that one Sushi, but I'll give someone else a chance to think about it for a while first.

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#22098 - 10/14/03 06:35 PM Re: Use your brain!
mwc Offline
aficionado

Registered: 07/21/02
Posts: 958
Loc: Texas(DFW)..that country to th...
I,m so glad to see you boys playing so nicely!
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#22099 - 10/14/03 06:41 PM Re: Use your brain!
Andy_R Offline
regular

Registered: 09/25/03
Posts: 7
Loc: Adamstown, MD USA
This is a nice spot for puzzles, but the best place to go is:
http://www.lateralpuzzles.com/

-Andy

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#22100 - 10/14/03 06:42 PM Re: Use your brain!
Andy_R Offline
regular

Registered: 09/25/03
Posts: 7
Loc: Adamstown, MD USA
Sorry about that last post, but I could not resist.
All in good fun. Please don't ban me. ;-)

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#22101 - 10/14/03 06:48 PM Re: Use your brain!
Andy_R Offline
regular

Registered: 09/25/03
Posts: 7
Loc: Adamstown, MD USA
Oh, and the answer to the puzzle is:
Turn switch 1 on and leave it on for 10 minutes or so.
Turn off switch 1, turn on switch 2, then go to the other room.
The light that is on goes with switch 2, the light that is off but warm goes with switch 1, and the light that is off and cold goes with switch 3.


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#22102 - 10/14/03 06:49 PM Re: Use your brain!
sushi Offline
connoisseur

Registered: 02/09/03
Posts: 1490
Loc: Dallas, TX
Yes, Andy the BAD BOY, you will be evicted!!!

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