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#1976 2012-06-29 23:35:22
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
The solution #1512 is correct. Good work!
#1513. A man can row downstream at the rate of 15 kilometers per hour and upstream at 10 kilometers per hour. Find the man's rate in still water and the rate of current.
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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#1977 2012-06-30 01:02:24
- 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.
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#1978 2012-06-30 23:17:56
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
The solution #1513 is perfect. Neat job!
#1514. A man rows upstream 15 kilometers and downstream 25 kilometers taking 5 hours each time. What is the velocity of current?
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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#1979 2012-07-01 00:44:58
- 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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#1980 2012-07-02 00:01:40
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
The solution #1514 is perfect. Good work!
#1515. A man can row 7.5 kilometers per hour in still water and he finds that it takes him twice as long to row up as to row down the river. Find the rate of current.
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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#1981 2012-07-02 00:37:21
- 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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#1982 2012-07-02 18:43:24
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
The solution #1515 is perfect. Neat job!
#1516. The current of a stream runs at the rate of 2 kilometers per hour. A motor boat goes 10 kilometers upstream and returns to the starting point in 55 minutes. Find the speed of the motor boat in still water.
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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#1983 2012-07-02 20:14:30
- 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
#1984 2012-07-03 23:46:30
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
#1517. A man can row upstream at 6 km/hour and downstream at 9 km/hour. Find the man's rate in still water and the rate of current.
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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#1985 2012-07-04 00:51:38
- 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.
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#1986 2012-07-04 13:13:48
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
The solutions #1516 and #1517 are correct. Brilliant!
#1518. A cistern can be filled in 8 hours but it takes 9 hours due to leak in its bottom. If the cistern is full, then what is the time that the leak would to empty?
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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#1987 2012-07-04 22:41:59
- 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
#1988 2012-07-05 22:20:59
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
#1519. A man on riding crosses a bridge in 3 minutes when riding is being done at 18 km/hour. What is the length of the bridge?
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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#1989 2012-07-05 22:34:08
- 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
#1990 2012-07-06 23:15:21
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
The solution #1519 is perfect. Good work!
#1520. Find the number of prime factors 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.
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#1991 2012-07-06 23:28:17
- 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
#1992 2012-07-07 23:34:14
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
The solution #1520 is perfect. Neat job!
#1521. What is the Greatest Common Divisor of 4 x 27 x 3125, 8 x 9 x 25 x 7, and 16 x 81 x 11 x 49?
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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#1993 2012-07-08 00:11:28
- 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
#1994 2012-07-09 01:37:06
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
The solution #1521 is perfect. Neat job!
#1522. The average of 50 numbers is 38. If two numbers, namely 45 and 55 are discarded, what is the average of remaining numbers?
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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#1995 2012-07-09 01:39:28
- 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
#1996 2012-07-09 23:28:11
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
The solution #1522 is perfect. Neat job!
#1523. Of the three numbers, second is twice the first and is also thrice the third. If their average is 44, find the largest number.
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
#1997 2012-07-10 01:43:01
- 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
#1998 2012-07-10 23:43:38
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,424
Re: Oral puzzles
Hi bobbym,
The solution #1523 is perfect. Good work!
#1524. Find the average of the squares of first 10 natural numbers.
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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#1999 2012-07-11 01:00:19
- 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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#2000 2012-07-11 01:09:35
- 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