# [bksvol-discuss] Re: Logic Puzzles, Brain Teasers, and Riddles

• From: "siss52" <siss52@xxxxxxxxxxx>
• To: <bksvol-discuss@xxxxxxxxxxxxx>
• Date: Sun, 17 Aug 2008 21:09:47 -0500

```Oh, Jake, I do believe you got it.  I got confused.

Sue S.

----- Original Message -----
From: "Jake Brownell" <jabrown@xxxxxxxxx>
To: <bksvol-discuss@xxxxxxxxxxxxx>
Sent: Sunday, August 17, 2008 8:19 PM
Subject: [bksvol-discuss] Re: Logic Puzzles, Brain Teasers, and Riddles

I'll give this a stab.

Let's call the shortest man 1, the middle man 2 and the tall man 3.

We know that #1 and #2 are not both wearing white hats, because if they were
then #3 must be wearing a black hat and #3 would know it (because there are
only 2 white hats).

It then follows that #1 and #2 must be wearing some combination of:
#1 white and #2 black
#1 black and #2 white
#1 black and #2 black

If #2 knows that #1's hat is white, then #2 knows that his own hat must be
black, because otherwise it would have been white and #3 would have known
the color of his hat.
Since #2 didn't know the color of his hat this alternative isn't possible.

Since the remaining alternatives both have #1 with a black hat, we now know
the reasoning and the color.

Cheers,
Jake
----- Original Message -----
From: "Chela Robles" <cdrobles693@xxxxxxxxx>
To: <bksvol-discuss@xxxxxxxxxxxxx>
Sent: Sunday, August 17, 2008 8:04 PM
Subject: [bksvol-discuss] Re: Logic Puzzles, Brain Teasers, and Riddles

> Hello all, I know I'm behind the times with email but I'm trying to
> catch up, now that I have stable internet connection, I have a puzzle
> for you all to solve, that is, if any of you can solve it, my sister,
> Brittnee, is a senior in high school taking algebra 2, and wanted me
> to help her with this puzzle, however I'm stumped, and this has been a
> very interesting 24 hours minus sleep time and church, to think of how
> to solve it, so here it goes.
> Black And White Hats
> Cannibals ambush a safari in the jungle and capture three men. The
> cannibals give the men a single chance to escape uneaten.
>
> The captives are lined up in order of height, and are tied to stakes.
> The man in the rear can see the backs of his two friends, the man in
> the middle can see the back the man in front, and the man in front
> cannot see anyone. The cannibals show the men five hats. Three of the
> hats are black and two of the hats are white.
>
> Blindfolds are then placed over each man's eyes and a hat is placed on
> each man's head. The two hats left over are hidden. The blindfolds are
> then removed and it is said to the men that if one of them can guess
> what color hat he is wearing they can all leave unharmed.
>
> The man in the rear who can see both of his friends' hats but not his
> own says, "I don't know". The middle man who can see the hat of the
> man in front, but not his own says, "I don't know". The front man who
> cannot see ANYBODY'S hat says "I know!"
>
> How did he know the color of his hat and what color was it?
>
>
> On 8/12/08, Bob <rwiley@xxxxxxxxxxxxx> wrote:
>> Hi Jim. The only book I can think of is "are you smarter than a fifth
>> grader?" that is in the collection.
>>
>> However, you can check out
>> http://www.braingle.com./
>> This is a site with all sorts of brain teasers and puzzles.
>>
>> I especially like the fractured phrases section. It presents garbled
>> phrases
>> that, once straightened out, are well known sayings. I used to use this
>> when
>> teaching folks to cut and paste on the computer. It made a boring subject
>> more tolerable.
>>
>> Check it out.
>>
>> Bob
>> ----- Original Message -----
>> From: <james.homme@xxxxxxxxxxxx>
>> To: <bksvol-discuss@xxxxxxxxxxxxx>
>> Sent: Tuesday, August 12, 2008 6:52 AM
>> Subject: [bksvol-discuss] Logic Puzzles, Brain Teasers, and Riddles
>>
>>
>>>
>>> Hi,
>>> A couple of years ago now, my best friend passed away. His little girl
>>> really likes this sort of thing. Do we have any books in the collection
>>> with this kind of stuff, or fun facts or trivia that might interest
>>> people
>>> who are somewhere around nine years old? I'd like to read it and have
>>> fun
>>> with her when I see her. She is so quiet. I never know what she's
>>> thinking,
>>> and I'd like to help her if she needs it.
>>>
>>> Thanks.
>>>
>>> Jim
>>>
>>> James D Homme, Usability Engineering, Highmark Inc.,
>>> james.homme@xxxxxxxxxxxx, 412-544-1810
>>>
>>> "The difference between those who get what they wish for and those who
>>> don't is action. Therefore, every action you take is a complete
>>> success,regardless of the results." -- Jerrold Mundis
>>> Highmark internal only: For usability and accessibility:
>>> http://highwire.highmark.com/sites/iwov/hwt093/
>>>
>>> To unsubscribe from this list send a blank Email to
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>>> line.
>>>
>>>
>>>
>>>
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>>> Version: 7.5.524 / Virus Database: 270.6.0/1603 - Release Date:
>>> 8/10/2008
>>> 6:13 PM
>>>
>>
>>  To unsubscribe from this list send a blank Email to
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>>
>>
>
>
> --
> Chela
> E-Mail: cdrobles693@xxxxxxxxx
> CONTACTS!): cdrobles693@xxxxxxxxxxx
>
> Blog: http://www.1jtcdr.wordpress.com
> MySpace: http://www.myspace.com/chelarobles (AGAIN, PLEASE E-MAIL ME
> BEFORE YOUR REQUEST IS IETHER REJECTED OR ACCEPTED!)
> Skype: jazzytrumpet (E-Mail ME ABOUT ADDING YOU ONTO MY SKYPE CONTACTS
> BEFORE I GIVE A CONFIRMATION Of YES OR NO!)
> Mobile Phone: (925) 250-5955 (ONLY FOR THOSE WHO WORK WITH ME, OR WHO KNOW
> ME)
> To unsubscribe from this list send a blank Email to
> bksvol-discuss-request@xxxxxxxxxxxxx
> put the word 'unsubscribe' by itself in the subject line.  To get a list
> of available commands, put the word 'help' by itself in the subject line.
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG.
> Version: 7.5.524 / Virus Database: 270.6.4/1616 - Release Date: 8/16/2008
> 5:12 PM
>
>

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```