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#2276 2012-11-07 21:46:05

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

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.

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#2277 2012-11-08 16:51:04

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

The solution #1638 is perfect. Brilliant!

#1639. A can do a job in 9 days while B is twice as fast. In how many days would the same job done if they work together?


Character is who you are when no one is looking.

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#2278 2012-11-08 21:17:27

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

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.

Online

#2279 2012-11-09 02:33:34

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 14,836

Re: Oral puzzles

Hi ganesh


“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

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#2280 2012-11-09 17:27:47

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym and anonimnystefy,

The solution #1639 is perfect. Good work!

#1640. If 20 workers can complete a task in 45 days, how many more workers would be required to complete it in 30 days?


Character is who you are when no one is looking.

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#2281 2012-11-09 21:51:26

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

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.

Online

#2282 2012-11-10 18:04:50

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

The solution #1640 is perfect. Neat work!

#1641. A is four times as good a workman as B and takes 12 days less to do a piece of work than B takes. In how many days B alone can do the whole work?


Character is who you are when no one is looking.

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#2283 2012-11-10 19:43:46

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

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.

Online

#2284 2012-11-11 18:36:27

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

The solution #1641 is correct. Neat work!

#1642. 25 men take 20 days to complete a certain work. 15 men left the work after some days. If the remaining work was completed in 37.5 days,   after how many days did 15 men leave the work?


Character is who you are when no one is looking.

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#2285 2012-11-11 23:58:44

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

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.

Online

#2286 2012-11-13 16:32:15

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

The solution #1642 is perfect. Brilliant!

#1643. Find the prime factorization of the following numbers:
(a) 1152
(b) 1296
(c) 1440
(d) 1584
(e) 1728


Character is who you are when no one is looking.

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#2287 2012-11-13 18:03:02

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

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.

Online

#2288 2012-11-14 17:37:30

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

The solutions (b), (c), and (d) are correct. Good work!

#1644. Given the Greatest Common Divisor (306, 657) = 9, find the Least Common Multiple (306, 657).


Character is who you are when no one is looking.

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#2289 2012-11-14 20:19:32

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

Hi ganesh;


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.

Online

#2290 2012-11-15 15:44:34

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

The solution #1644 is correct. Neat work!

#1645. Find the Least common multiple and Greatest common divisor of 35, 48, 56 by applying the prime factorization method.


Character is who you are when no one is looking.

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#2291 2012-11-15 20:24:28

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

Hi ganesh;


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.

Online

#2292 2012-11-16 20:13:50

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

The solution #1645 is perfect. Good work!

#1646. Solve : 4x - 3y - 8 = 0 and 6x - y - 29/3 = 0.


Character is who you are when no one is looking.

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#2293 2012-11-16 20:20:19

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

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.

Online

#2294 2012-11-17 17:35:36

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

The solution #1646 is correct. Good work!

#1647. Solve : 4x + 7y = 20 and x - 13y = 21.


Character is who you are when no one is looking.

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#2295 2012-11-17 21:59:51

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

Hi ganesh;


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.

Online

#2296 2012-11-18 17:59:19

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

#1648. Solve : 4x + 6/y = 15 and x - 8/y = 14.


Character is who you are when no one is looking.

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#2297 2012-11-18 18:46:49

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

Hi ganesh;


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.

Online

#2298 2012-11-19 19:26:07

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

#1649. Solve : 5x + 3y = 70 and 3x - 7y = 60.


Character is who you are when no one is looking.

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#2299 2012-11-19 22:08:28

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,621

Re: Oral puzzles

Hi ganesh;


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.

Online

#2300 2012-11-20 16:43:21

ganesh
Moderator
Registered: 2005-06-28
Posts: 12,944

Re: Oral puzzles

Hi bobbym,

The solution #1648 is correct; my aplology.

The solution #1649 is perfect. Brilliant!

#1650. Solve : x/2 - y/5 = 4 and x/7 + y/15 = 3.


Character is who you are when no one is looking.

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