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#1726 2012-02-18 01:40:43
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Oral puzzles
Hi;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#1727 2012-02-18 02:40:35
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
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
The knowledge of some things as a function of age is a delta function.
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#1728 2012-02-19 01:31:46
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,423
Re: Oral puzzles
Hi bobbym and anonimnystefy,
The solution #1405 is perfect. Good work!
#1406.
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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#1729 2012-02-19 01:40:05
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Oral puzzles
Hi;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#1730 2012-02-20 02:00:12
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,423
Re: Oral puzzles
Hi bobbym,
The solution #1406 is correct. Outstanding!
#1407. A sum of money lent out at simple interest amounts to $720 after 2 years and to $1020 after a further period of 5 years. Find the sum.
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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#1731 2012-02-20 05:24:04
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Oral puzzles
Hi;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#1732 2012-02-21 02:02:35
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,423
Re: Oral puzzles
Hi bobbym,
The solution #1407 is correct. Excellent!
#1408. The perimeters of five squares are 24 cm, 32 cm, 40 cm, 76 cm, and 80 cm respectively. Find the perimeter of another square equal in area to sum of the areas of these squares.
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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#1733 2012-02-21 02:21:15
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Oral puzzles
Hi ganesh;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#1734 2012-02-22 01:55:03
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,423
Re: Oral puzzles
Hi bobbym,
The solution #1408 is correct. Brilliant!
#1409.
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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#1735 2012-02-22 01:58:14
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Oral puzzles
Hi;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#1736 2012-02-23 01:51:52
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,423
Re: Oral puzzles
Hi bobbym,
The solution #1409 is perfect. Excellent!
#1410. 10 men working 6 hours a day can complete a work in 18 days. How many hours a day must 15 men work to complete the same work in 12 days?
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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#1737 2012-02-23 03:38:53
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Oral puzzles
HI;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#1738 2012-02-24 01:56:35
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,423
Re: Oral puzzles
Hi bobbym,
The solution #1410 is correct. Good work!
#1411. A man spends 12½ % of his salary on items of daily use and 30 % of the remainder on house rent. After that, he is left with $2940. How much is his salary?
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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#1739 2012-02-24 02:19:47
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Oral puzzles
Hi ganesh;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#1740 2012-03-22 17:21:13
- Denominator
- Member
- Registered: 2009-11-23
- Posts: 220
Re: Oral puzzles
Hey guys,
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#1741 2012-03-31 18:21:10
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,423
Re: Oral puzzles
Hi bobbym and Denominator,
The solution #1411 is perfect. Well done!
#1412. A and B can do a piece of work in 20 days and 12 days respectively. A started the work alone and then after days B joined him till the completion of the work. How long did the work last?
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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#1742 2012-03-31 22:44:57
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
Re: Oral puzzles
Hi ganesh
I had to do it like that because my phone won't show the number of daya.
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
The knowledge of some things as a function of age is a delta function.
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#1743 2012-04-02 01:21:10
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,423
Re: Oral puzzles
Hi anonimnystefy,
I made a mistake in the problem #1412. The problem should have been
'A and B can do a piece of work in 20 days and 12 days respectively. A started the work alone and then after 4 days B joined him till the completion of the work. How long did the work last?'
Mistake regretted.
#1413. The difference between the compound interest (compounded annually) and the simple interest on a sum of $1000 at a certain rate of interest for 2 years is $10. Find the rate of interest per annum.
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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#1744 2012-04-02 01:25:42
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
Re: Oral puzzles
Hi ganesh
Is my solution correct for n=4?
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
The knowledge of some things as a function of age is a delta function.
Offline
#1745 2012-04-02 21:18:47
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,423
Re: Oral puzzles
Hi anonimnystefy,
The solution I get for #1412 is 10 days and #1413 is 10 %.
#1414. The number of employees working in a farm is increased by 25% and the wages per head are decreased by 25%. If it results in x% decreased in total wages, then what is the value of x?
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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#1746 2012-04-02 21:32:25
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
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
The knowledge of some things as a function of age is a delta function.
Offline
#1747 2012-04-03 00:54:54
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,423
Re: Oral puzzles
Hi anonimnystefy,
The solution #1414 is correct. Brilliant!
#1415. What is the value of
?It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
Offline
#1748 2012-04-03 00:56:43
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
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
The knowledge of some things as a function of age is a delta function.
Offline
#1749 2012-04-03 17:27:18
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Oral puzzles
Hi ganesh;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#1750 2012-04-03 20:58:56
- Denominator
- Member
- Registered: 2009-11-23
- Posts: 220
Re: Oral puzzles
Hey ganesh,
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