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04-22-2010, 06:15 PM   #2
sixerfan82
College star

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Posts: 3,898
Re: Brain Teasers and Riddles

Quote:
 5. You are given 3 boxes. 1 box contains a million dollars, the others is empty. If you pick correctly which box has the million dollars, you win the million dollars. Suppose you pick Box 1. The host then opens Box 3 to show you it's empty, then he asks you if you want to change your choice to Box 2. From a probability aspect, would it matter if you changed your choice or not?

From a probability standpoint yes.

By the host eliminating 1 choice, you can choose between 2 that it might be and 1 that it isn't, therefore you get an extra 33.3 percent chance,

Quote:
 6. You are in a classroom full of 20 students. Everyone has a paper. The teacher says exchange papers with everyone that is shorter than you. How many total exchanges will there be?

My guess is 0. Both people can't be shorter than another, and if you're the same height there is no exchange.

04-22-2010, 06:37 PM   #3
GatorKid117
Oh the Bealsanity

Join Date: Feb 2009
Location: Shenzhen China
Posts: 3,405
Re: Brain Teasers and Riddles

I always liked this one when I was younger: Connect all of the dots using 4 straight lines w/o lifting your pencil.

o o o

o o o

o o o

Quote:
 My guess is 0. Both people can't be shorter than another, and if you're the same height there is no exchange.

That's what I was thinking. I'll look over them more when I get the time.

Edit: Lame, the dots aren't spaced out. If you want to try it, it's much easier if you space em out in a square.

 04-22-2010, 06:40 PM #4 AirGauge23 Sound the Charge     Join Date: Jun 2006 Location: Border Posts: 4,461 Re: Brain Teasers and Riddles 1. 38mph, no?
04-22-2010, 06:58 PM   #5
Coach A
Coach America

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Re: Brain Teasers and Riddles

Quote:
 Originally Posted by AirGauge23 1. 38mph, no?
No

Quote:
 From a probability standpoint yes. By the host eliminating 1 choice, you can choose between 2 that it might be and 1 that it isn't, therefore you get an extra 33.3 percent chance,

Correct

Quote:
 My guess is 0. Both people can't be shorter than another, and if you're the same height there is no exchange.

Correct

04-22-2010, 07:25 PM   #6
GatorKid117
Oh the Bealsanity

Join Date: Feb 2009
Location: Shenzhen China
Posts: 3,405
Re: Brain Teasers and Riddles

Quote:
 In an island there are 2 type of people, knaves and knights. Knaves always lie, and knights always tell the truth. You encounter 2 people. Person A and Person B. A: "I'm a knave or B is a knight". B doesn't say anything. Determine what A is and what B is (Knight or Knave). If not possible to determine, say so.

Well, if I understand this correctly, no one can say they are a knave. Knaves would have to say they are knights while knights would have to say they are knights as well b/c they always tell the truth. Thus, A is a knave. The or is kinda throwing me off though. I guess I would say B is a knave too because he would be lying about B as well.

04-22-2010, 07:42 PM   #7
Mikaiel
Shoot it Boobie !!!

Join Date: Oct 2007
Posts: 4,626
Re: Brain Teasers and Riddles

Quote:
 Originally Posted by Coach A 1. You drive to work at an average speed of 32 miles/hour. The trip back your average speed was 44 miles/hour. Is it possible to determine what was your average speed for the whole trip? If so, what was it?

37.05

04-22-2010, 11:52 PM   #8
Coach A
Coach America

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Posts: 323
Re: Brain Teasers and Riddles

Quote:
 Originally Posted by GatorKid117 Well, if I understand this correctly, no one can say they are a knave. Knaves would have to say they are knights while knights would have to say they are knights as well b/c they always tell the truth. Thus, A is a knave. The or is kinda throwing me off though. I guess I would say B is a knave too because he would be lying about B as well.

No
Quote:
 37.05

Correct

04-22-2010, 11:55 PM   #9
Doomsday Dallas
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Re: Brain Teasers and Riddles

Quote:
 Originally Posted by Mikaiel 37.05

explain.

04-23-2010, 12:20 AM   #10
Mikaiel
Shoot it Boobie !!!

Join Date: Oct 2007
Posts: 4,626
Re: Brain Teasers and Riddles

Quote:
 Originally Posted by Doomsday Dallas explain.

You can't do (32+44) / 2 because that would mean you were going at 32 for the exact same time that you were at 44. Let's say you have to drive for 40 miles and you drive the 1st 20 miles at 5 miles/hour and the other 20 miles at 195 miles/hour. Your average speed is gonna be A LOT smaller than 100 miles/hour.

d = distance home-work
t1 = Time between home-work going at 32 miles/hour
t2 = Time between work-home going at 44 miles/hour

speed = distance / time

So :

32 = d / t1
t1 = d / 32

44 = d / t2
t2 = d / 44

x = average speed

x = 2d / (t1 + t2)

x = 2d / (d/32 + d/44)

x = 2d / [d (1/32 + 1/44)]

x = 2 / (1/32 + 1/44)

x = 37.05

04-23-2010, 12:34 AM   #11
I hit open jumpers.

Join Date: Jun 2006
Posts: 1,203
Re: Brain Teasers and Riddles

Quote:
 In an island there are 2 type of people, knaves and knights. Knaves always lie, and knights always tell the truth. You encounter 2 people. Person A and Person B. A: "I'm a knave or B is a knight". B doesn't say anything. Determine what A is and what B is (Knight or Knave). If not possible to determine, say so.

There are only four cases.

Case 1: Suppose both A and B are knaves. Then one part of A's statement is true, even though B is not a knight. Since his statement has an "or", only one part needs to be true for A to be telling the truth. Hence A is telling the truth. But this contradicts the fact that he's a knave and is supposed to lie. Hence case 1 is impossible.

Case 2: Suppose A is a knave and B is a knight. Then again, A's statement would be a true statement, which contradicts his job, as a knave, to lie. Hence case 2 is impossible.

Case 3: A is a knight, B is a knave. Now both parts of A's statement is false; i.e. A is not a knave and B is not knight. Hence A is lying, and this contradicts the fact that he is a knight. Hence case 3 is impossible.

Case 4: A is a knight, B is a knight. Now A's statement is correct, since B is a knight. This makes sense because A should be telling the truth. Hence both A and B are knights, and this case is the only possibility.

04-23-2010, 12:38 AM   #12
Coach A
Coach America

Join Date: Feb 2007
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Posts: 323
Re: Brain Teasers and Riddles

Quote:
 Originally Posted by WADE MONEY Case 4: A is a knight, B is a knight. Now A's statement is correct, since B is a knight. This makes sense because A should be telling the truth. Hence both A and B are knights, and this case is the only possibility.

bingo!

04-23-2010, 12:56 AM   #13
iamgine
...

Join Date: Nov 2007
Posts: 11,022
Re: Brain Teasers and Riddles

Quote:
 Originally Posted by Coach A 7.. You have 2 ropes and a box of matches. You want to measure 60 minutes exactly using only the ropes and the box of matches. Here is what you know: a) Each rope takes exactly 80 minutes to burn end to end. b) The rope itself is made out of different material throughout the rope. So, it's rate of burning is not constant throughout the rope. Can you measure exactly 60 minutes? If so, how?
We know you can measure 40 minutes by lighting both ends of the rope. So first you light one rope at two ends and the other rope on one end. Then when the first rope burn out, you'll know 40 minutes has passed and the second rope only has 40 more minutes to burn out. If you immediately light the second rope at the other end, that will measure half of 40 minutes which is 20 minutes. That way 40 minutes + 20 minutes = 60 minutes.

04-23-2010, 01:03 AM   #14
EroticVanilla
Sexual Chocolate=GOAT

Join Date: Feb 2009
Posts: 1,620
Re: Brain Teasers and Riddles

Quote:
 Originally Posted by sixerfan82 From a probability standpoint yes. By the host eliminating 1 choice, you can choose between 2 that it might be and 1 that it isn't, therefore you get an extra 33.3 percent chance.
I've never bought that though process, I don't understand why just because C has been eliminated as an option it would have any effect on A or B. It seems that after you have eliminated C the choice between A or B would be an independent event from C.

Someone who is good in math could probably explain this, but really from what I can tell it should have no effect.

 04-23-2010, 01:06 AM #15 InspiredLebowski Roy Hibbert Super Star     Join Date: Jan 2008 Location: Birthplace of basketball Posts: 26,283 Re: Brain Teasers and Riddles A cowboy rides into town on Friday, stays three days, leaving on Friday? HOW!? OMGZ!

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