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#4051 2015-09-18 22:37:16
#4052 2015-09-19 02:28:11
- 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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#4053 2015-09-19 06:53:24
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi,
The solution #2509 is perfect! Good work, zetafunc and bobbym!
#2510. Solve :
hence the value of 'p' if y = px - 2.
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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#4054 2015-09-19 07:15:28
- math9maniac
- Member
- From: Tema
- Registered: 2015-03-30
- Posts: 443
Re: Oral puzzles
Only a friend tells you your face is dirty.
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#4055 2015-09-19 07:18:06
- 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
#4056 2015-09-19 11:11:12
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi,
The solution #2510 is correct, math9maniac and bobbym! Brilliant!
You have missed the latter part of the problem , math9maniac!
#2511. The incomes of X and Y are in the ratio 8:7 and their expenditures are in the ratio 19:16. If each saves $1250, find their incomes.
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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#4057 2015-09-19 22:47:05
- 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.
Offline
#4058 2015-09-20 09:02:17
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi bobbym,
The solution #2511 is perfect! Excellent!
#2512. Points 'A' and 'B' are 70 kilometers apart on a highway. A car starts from 'A' and another car starts from 'B' simultaneously. If they travel in the same direction, they meet in 7 hours, but they travel towards each other, they meet in one hour. Find the speed of the two cars.
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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#4059 2015-09-20 12:00:47
- 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
#4060 2015-09-20 17:10:48
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi bobbym,
The solution #2512 is correct! Good work!
#2513. The ratio of incomes of two persons is 9:7 and the ratio of their expenditures is 4:3. If each of them saves $200 per month, find their monthly incomes.
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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#4061 2015-09-20 18:07:43
- 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.
Offline
#4062 2015-09-20 18:51:27
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi bobbym,
The solution #2513 ( both parts) is correct! Neat work!
#2514. Find the condition that the point (x,y) may lie on the line joining (3,4) and (-5,-6).
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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#4063 2015-09-21 01:35:12
- math9maniac
- Member
- From: Tema
- Registered: 2015-03-30
- Posts: 443
Re: Oral puzzles
Only a friend tells you your face is dirty.
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#4064 2015-09-21 12:40:39
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi math9maniac,
#2515. Evaluate :
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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#4065 2015-09-21 12:42:47
#4066 2015-09-21 14:04:40
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi zetafunc,
#2516. Two customers are visiting a particular shop in the same week (Monday to Saturday). Each is equally likely to visit the shop on any one day as on another. What is the probability that both will visit the shop on
(i) the same day?
(ii) different days?
(iii) consecutive 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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#4067 2015-09-24 09:22:45
- 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
#4068 2015-09-24 15:38:11
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi bobbym,
#2517. Find the probability that a number selected at random from the numbers 1, 2, 3, ....35 is a
(i) prime number
(ii) multiple of 7
(iii) multiple of 3 or 5.
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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#4069 2015-09-24 17:50:41
- 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
#4070 2015-09-24 19:20:33
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi bobbym,
The solution #2517 (all three parts) is/are correct! Good work!
#2518. Find the probability of a number selected from 1 to 25 is not a prime number then each of the given numbers is equally likely to be selected.
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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#4071 2015-09-25 17:57:28
- 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
#4072 2015-09-25 18:40:12
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi bobbym,
The Solution #2518 is correct! Smart work!
#2519. Find the numbers a, b, c between 2 and 18 such that their sum is 25. The numbers 2, a, b are in Arithmetic Progression and the numbers b, c, 18 are Geometric Progression.
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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#4073 2015-09-25 21:41:00
- math9maniac
- Member
- From: Tema
- Registered: 2015-03-30
- Posts: 443
Re: Oral puzzles
Only a friend tells you your face is dirty.
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#4074 2015-09-25 22:28:36
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,405
Re: Oral puzzles
Hi math9maniac,
The solution #2519 is perfect! Excellent, math9maniac!
#2520. The first term of a Geometric Progression is 64 and the common ratio is 'r'. Find 'r' if the average of the first and fourth terms is 140.
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
#4075 2015-09-26 02:45:52
- 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