Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
#1851 2012-05-07 01:19:30
- 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
#1852 2012-05-07 21:21:55
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,410
Re: Oral puzzles
Hi bobbym and anonimnystefy,
The solution #1454 is correct. Outstanding, anonimnystefy!
#1455. The average age of 15 students of a class is 15 years. Out of these, the average age of 5 students is 14 years and that of the other 9 students is 16 years. What is the age of the 15[sup]th[/sup] student?
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
#1853 2012-05-07 22:06:24
- 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.
Offline
#1854 2012-05-08 04:56:39
- 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
#1855 2012-05-08 23:43:26
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,410
Re: Oral puzzles
Hi bobbym and anonimnystefy,
The solution #1455 is correct. Good work!
#1456. Two trains are running in opposite direction with the same speed. If the length of each train is 120 meters, and they cross each other in 12 seconds, what is the speed of each train (in kilometers per hour)?
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
#1856 2012-05-08 23:55:30
- 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
#1857 2012-05-09 00:44:52
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
Re: Oral puzzles
Hi ganesh
Stefy
Last edited by anonimnystefy (2012-05-09 00:45:06)
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
#1858 2012-05-09 23:28:48
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,410
Re: Oral puzzles
Hi bobbym and anonimnystefy,
The solution
Well done, anonimnystefy!
#1457. The difference between simple and compound interest (compounded annually) on a sum of money for 2 years at 10% per annum is $65. What is 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.
Offline
#1859 2012-05-10 00:31:38
- 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
#1860 2012-05-10 23:39:50
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,410
Re: Oral puzzles
Hi bobbym,
The solution #1457 is correct. Good work!
#1458. In an examination, 34% failed in Mathematics and 42% failed in English. If 20% failed in both the subjects, what is the percentage of students who passed in both subjects?
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
#1861 2012-05-10 23:57:57
- 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
#1862 2012-05-12 00:37:07
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,410
Re: Oral puzzles
Hi bobbym,
The solution #1458 is correct. Brilliant!
#1459. A reduction of 20% in the price of rice enables a person to buy 3.5 kilograms more rice for $385. What is the original price of rice per kilogram?
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
#1863 2012-05-12 04:48:08
- 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
#1864 2012-05-12 05:29:44
- 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
#1865 2012-05-13 00:18:32
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,410
Re: Oral puzzles
Hi bobbym and anonimnystefy,
#1460. The perimeters of two squares are 40 centimeters and 32 centimeters. Find the perimeter of a third square whose area is the difference of the areas of the two 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.
Offline
#1866 2012-05-13 00:24:16
- 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
#1867 2012-05-13 19:46:40
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,410
Re: Oral puzzles
Hi bobbym,
The solution #1460 is correct. Brilliant!
#1461.
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
#1868 2012-05-13 21:02:52
- 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
#1869 2012-05-13 23:07:57
- 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
#1870 2012-05-14 23:39:50
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,410
Re: Oral puzzles
Hi bobbym and anonimnystefy,
The solution #1461 is correct. Brilliant!
#1462. 1/10 of a rod is colored red, 1/20 orange, 1/30 yellow, 1/40 green, 1/50 blue, 1/60 black, and the rest is violet. If the length of the violet portion of the rod is 12.08 meters, then what is the length of the rod?
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
#1871 2012-05-15 00:12:42
- 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
#1872 2012-05-15 21:33:12
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,410
Re: Oral puzzles
Hi bobbym,
The solution #1462 is correct. Brilliant!
#1463. A and B can complete a piece of work in 15 days and 10 days respectively. They contracted to complete the work for $30,000. What is the share of A in the contracted money?
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
#1873 2012-05-15 21:54:29
- 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
#1874 2012-05-16 22:51:10
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,410
Re: Oral puzzles
Hi bobbym,
The solution #1463 is correct. Excellent!
#1464. A train running at a speed of 45 kilometers per hour clears a platform 180 meters long in 24 seconds. What is the length of the train?
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
#1875 2012-05-16 22:55:20
- 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