BRAIN TEASERS THREAD - Page 6

27offsuit · #51 10-30-2006, 03:32 PM

I'm surprised this one hasn't shown yet:

Three men enter a hotel together and get 3 single rooms. The cost of each room is $10. They all pay and head to their respective rooms while the bellboy begins the task of bringing up their bags.

Just then the desk manager realizes he forgot to give them their $5 rebate special that they are advertising for three rooms. He gives the bellboy $5 and says "give this to those 3 gentlmen when you bring up their bags.

Bellboy is like "Crap, how do I spliy $5 three ways? Ah well, I'll just give them a dollar each and keep the left over $2." With that he goes up to each mans room, drops off his bags and gives them each $1.

Sooo...if they each get their rebate ($10 - $1 = $9) and the bellboy kept $2, that is only $29?

Where is the other $1?

metsandfinsfan · #52 10-30-2006, 04:23 PM

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I'm surprised this one hasn't shown yet:

Three men enter a hotel together and get 3 single rooms. The cost of each room is $10. They all pay and head to their respective rooms while the bellboy begins the task of bringing up their bags.

Just then the desk manager realizes he forgot to give them their $5 rebate special that they are advertising for three rooms. He gives the bellboy $5 and says "give this to those 3 gentlmen when you bring up their bags.

Bellboy is like "Crap, how do I spliy $5 three ways? Ah well, I'll just give them a dollar each and keep the left over $2." With that he goes up to each mans room, drops off his bags and gives them each $1.

Sooo...if they each get their rebate ($10 - $1 = $9) and the bellboy kept $2, that is only $29?

Where is the other $1?

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cause i think this one and the monty hall one have been posted so many times on 2+2 that you get instabanned for posting it

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ski · #53 10-30-2006, 04:56 PM

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We have 3 cannibals and 3 explorers and a boat that has the capacity for 2 ppl. How do you pass all 6 persons safely from one side fo the river to the other of the river?
If there is ever more cannibals than explorers on either side the cannibals will eat the explorers.

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Why not just do one of each on each trip??

ski · #54 10-30-2006, 05:02 PM

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three logicians numbers answer in white 20,30,50
log c figured out his number is 50, so we know a + b= 50. of all the numbers that add to 50, 20 and 30 are the only ones that allow for c to figure it out.with a-20,b-30, c must be 10 or 50,if c were 10, then b would know b was 10 or 30, and he cant be 10, so he would know hes 30. but b doesnt know his number so c then knows he is 50.

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Did you just get those numbers ( 20+30 ) through trial and error or is there some formula to it?

r3vbr · #55 10-30-2006, 05:09 PM

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not quite right, but you have the idea. And i said not counting covers, but your amount of covers was correct. Real close

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OK, I re-read it:
It's 801 or 802. Page 100 of book 10 was eaten through, but it's not clear whether or not page 1 of book 1 was.

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jam yes jam 802 is correct.

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is this a word-game? didnt understand the answer.. why not 1000 pages?

baumer · #56 10-30-2006, 05:20 PM

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here is a favorite of mine

You are rushing your mother to the hospital

There is a fork in the road and you dont remember which way to go

There are two twin brothers there, one who always lies and one who always tells the truth. They look identical, and it is impossible to tell them apart

You only have time to ask one brother one question. And again, the one who answers you have no idea if he is the one who lies or tells the truth

What one question can you ask so that no matter which brother answers, you will know which way to go to save your mother

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Answer: "If I asked your brother which way is it to the hospital, what would he say?" Then go in the other direction. 

[/ QUOTE ] Or: There is an alternative answer. Ask one of them "If I were to ask you which way to go, what would you say?" Then go the way he says. 

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well the liar will say the wrong way but the truthteller will tell you the right way....effective....

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What? The truthteller will obviously tell you the right way, but so will the liar. The liar knows he would tell you the wrong answer to the question "Which is the right way?" so when you ask him "If I were to ask which way is the right way, what would you tell me?" he would have to lie about his answer, so he tells you the correct way.

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I thought you were mistaken, but after reading this a couple times, it works. Just watched Labyrinth yesterday, had to chime in for no good reason.

Deorum · #57 10-30-2006, 05:39 PM

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I'm surprised this one hasn't shown yet:

Three men enter a hotel together and get 3 single rooms. The cost of each room is $10. They all pay and head to their respective rooms while the bellboy begins the task of bringing up their bags.

Just then the desk manager realizes he forgot to give them their $5 rebate special that they are advertising for three rooms. He gives the bellboy $5 and says "give this to those 3 gentlmen when you bring up their bags.

Bellboy is like "Crap, how do I spliy $5 three ways? Ah well, I'll just give them a dollar each and keep the left over $2." With that he goes up to each mans room, drops off his bags and gives them each $1.

Sooo...if they each get their rebate ($10 - $1 = $9) and the bellboy kept $2, that is only $29?

Where is the other $1?

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You miscalculated the total by adding the bellboy's cost twice. Each man paid $9, for a total of $27. That $27 cost is broken down into two parts: $25 for the total cost of the rooms plus $2 for the bellboy. The total allotment of the $30 is found by adding what they paid to what they received back, $27 + $3, not what they paid plus what they paid the bellboy, as what they paid the bellboy is already included in the cost of what they paid.

Deorum · #58 10-30-2006, 05:51 PM

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not quite right, but you have the idea. And i said not counting covers, but your amount of covers was correct. Real close

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OK, I re-read it:
It's 801 or 802. Page 100 of book 10 was eaten through, but it's not clear whether or not page 1 of book 1 was.

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jam yes jam 802 is correct.

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is this a word-game? didnt understand the answer.. why not 1000 pages?

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Logic in white, if you want it:
 When placed on a bookshelf with the spine facing you, the first page of a book is located on the right hand side, and the last page is located on the left hand side. Thus, if the bookworm started on page one of the first volume, he did not eat pages 2-100 of that volume, and if he finished on page 100 of the tenth volume, he did not eat pages 1-99.

Deorum · #59 10-30-2006, 05:55 PM

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One of my favorites from long ago, I hope I get it right. I have purposefully changed the usual wording to prevent easy googling:

A & B are integers greater than 1 and less than 100.

Mr. Add knows (A+B)
Mr. Multiply knows (A*B)

Mr. Add says to Mr. Multiply, "You don't know A and B."
Mr. Multiply says, "Now I do know A and B."
Mr. Add says, "Now I do too."

What are A & B?

~MagicMan

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I would really appreciate it if someone would please post the answer to this with the reasoning.

ScottySo · #60 10-31-2006, 01:06 AM

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One of my favorites from long ago, I hope I get it right. I have purposefully changed the usual wording to prevent easy googling:

A & B are integers greater than 1 and less than 100.

Mr. Add knows (A+B)
Mr. Multiply knows (A*B)

Mr. Add says to Mr. Multiply, "You don't know A and B."
Mr. Multiply says, "Now I do know A and B."
Mr. Add says, "Now I do too."

What are A & B?

~MagicMan

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I would really appreciate it if someone would please post the answer to this with the reasoning.

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yes please