Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2012-02-28 21:52:24

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Bafflers?

Hi;

Due to increased traffic in my other two problem threads I have started this one. It will contain problems that appear difficult but are not. Or maybe, just not as difficult as the other two threads.

Baffler #1

An opaque jar contains100 marbles. 50 of them are blue and 50 are white. 25 marbles are picked out of the jar at random. They are discarded and 25 blue marbles are put into the jar. This process is done 9 more times. What percentage of white marbles remains?

A says) 4%

B says) About 2.8%

C says) I agree with either (A or B) or (A and B) I am not sure.

D says) C is right.

E says) B is close but he does not have an exact answer. I have a method.

B says) I have a method now!

Who is closest and can you find E's method?


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#2 2012-02-28 23:26:33

phrontister
Real Member
From: The Land of Tomorrow
Registered: 2009-07-12
Posts: 3,820

Re: Bafflers?

Hi Bobby,

EDIT:
Just found a

...not sure if it's E's, though.

Last edited by phrontister (2012-02-28 23:33:09)


"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

Offline

#3 2012-02-29 00:04:30

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

Hi phrontister;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#4 2012-02-29 13:43:05

phrontister
Real Member
From: The Land of Tomorrow
Registered: 2009-07-12
Posts: 3,820

Re: Bafflers?

Hi Bobby,

Last edited by phrontister (2012-02-29 14:34:42)


"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

Offline

#5 2012-02-29 17:29:16

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

Hi phrontister;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#6 2012-02-29 18:08:19

phrontister
Real Member
From: The Land of Tomorrow
Registered: 2009-07-12
Posts: 3,820

Re: Bafflers?

Hi Bobby,


"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

Offline

#7 2012-02-29 18:18:21

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#8 2012-02-29 18:36:29

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 14,886

Re: Bafflers?

Hi bobbym


“Here lies the reader who will never open this book. He is forever dead.

“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

Offline

#9 2012-02-29 18:39:30

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

It is roughly 7:37 AM for you. Is this not a little early for you?


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#10 2012-02-29 18:43:39

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 14,886

Re: Bafflers?

Hi bobbym

You don't like seeing me online? sad

Anyway, my classes start a little later for me today, so I am able to go here with wifi on my phone. smile


“Here lies the reader who will never open this book. He is forever dead.

“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

Offline

#11 2012-02-29 18:44:29

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

I do not mind at all. But it is a change in your habits.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#12 2012-02-29 18:47:16

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 14,886

Re: Bafflers?

Hi bobbym

It's not.I usually wake up at 6.30 when I go to school I'm the morning


“Here lies the reader who will never open this book. He is forever dead.

“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

Offline

#13 2012-02-29 18:48:04

phrontister
Real Member
From: The Land of Tomorrow
Registered: 2009-07-12
Posts: 3,820

Re: Bafflers?

Hi Bobby,


"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

Offline

#14 2012-02-29 18:48:51

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

6:30 AM was a little early for me.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#15 2012-02-29 18:51:27

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 14,886

Re: Bafflers?

So were you ever late for school?


“Here lies the reader who will never open this book. He is forever dead.

“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

Offline

#16 2012-02-29 18:53:06

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

Hi phrontister;

I understand perfectly. It is okay to tell all your ideas and it is welcomed by me. I also thank you for looking at the problem.

I was never late for school.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#17 2012-02-29 18:55:38

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 14,886

Re: Bafflers?

Hi bobbym

That's a little farfetched (if that word can be used here). Never is a strong word, unlike ever.


“Here lies the reader who will never open this book. He is forever dead.

“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

Offline

#18 2012-02-29 18:57:30

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

As farfetched as it may seem to you nevertheless it is the truth.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#19 2012-02-29 19:02:25

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 14,886

Re: Bafflers?

If you say so.


“Here lies the reader who will never open this book. He is forever dead.

“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

Offline

#20 2012-02-29 19:05:21

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

I had trouble showing up and when I did, it was trouble but I was never late.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#21 2012-02-29 19:07:23

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 14,886

Re: Bafflers?

So you were always either on time, or didn't show up at all?


“Here lies the reader who will never open this book. He is forever dead.

“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

Offline

#22 2012-02-29 23:17:05

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

That is correct! Some classes were so delightful I would never miss them. Others bored me to tears.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#23 2012-03-02 01:06:44

gAr
Member
Registered: 2011-01-09
Posts: 3,462

Re: Bafflers?

Hi bobbym,


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

#24 2012-03-02 01:18:49

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 83,247

Re: Bafflers?

Hi gAr;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#25 2012-03-02 01:26:12

gAr
Member
Registered: 2011-01-09
Posts: 3,462

Re: Bafflers?

Hi bobbym,

Thanks for reminding me of the problem, I almost forgot the solution.


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

Board footer

Powered by FluxBB