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#4026 2015-09-15 23:38:24
#4027 2015-09-16 00:32:55
- 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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#4028 2015-09-16 07:58:31
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,422
Re: Oral puzzles
Hi zetafunc and bobbym,
The solution #2499 is perfect! Excellent, zetafunc and bobbym!
#2500. On selling a tea-set at 5% loss and a lemon-set at 15% gain, a crockery seller gains $7. If he sells the tea-set at 5% gain and the lemon-set at 10% gain, he gains $13. Find the actual prize of the tea-set and lemon-set.
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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#4029 2015-09-16 15:24:28
- 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
#4030 2015-09-16 15:49:03
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,422
Re: Oral puzzles
Hi bobbym,
The solution #2500 is correct! Neat work!
#2501. Cards marked with the numbers 2 to 101 are placed in a box and mixed thoroughly. One card is drawn from this box. Find the probability that the number on the card is :
(i) a number less than 14.
(ii) a prime number less than 20.
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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#4031 2015-09-16 21:39:49
#4032 2015-09-17 00:20:36
- 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
#4033 2015-09-17 07:28:44
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,422
Re: Oral puzzles
Hi zetafunc and bobbym,
The solution 2501 (both parts) are correct Good work, zetafunc and bobbym!
!#2502. A box contains 100 red cards, 200 yellow cards, and 50 blue cards. If a card is drawn at random from the box, then find the probability that
(i) a blue card
(ii) not a yellow card
(iii) neither yellow nor a blue card.
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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#4034 2015-09-17 07:29:40
#4035 2015-09-17 11:16:27
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,422
Re: Oral puzzles
H zetafunc,
The solution #2502 is perfect (all three parts)! Brilliant!
#2503. A box contains cards numbered 3, 5, 7, 9, ....., 35, 37. A card is drawn at random from the box. Fnd the probability that the number on the card is a prime 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.
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#4036 2015-09-17 11:20:15
#4037 2015-09-17 11:49:04
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,422
Re: Oral puzzles
Hi zetafunc,
The solution #2503 is correct! Neat work!
#2504. 10 years later, 'A' will be twice as old as 'B' and 5 years ago, 'A' was 3 times as old as 'B'. What are the present ages of 'A and 'B'?
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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#4038 2015-09-17 11:54:41
#4039 2015-09-17 12:04:27
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,422
Re: Oral puzzles
hi zetafunc,
The solution # 2504 is correct! Good work!
#2505. Solve :
See you later!
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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#4040 2015-09-17 12:35:42
#4041 2015-09-17 14:06:34
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,422
Re: Oral puzzles
Hi zetafunc,
The solution #2505 (two values) is correct! E xcellent!
#2506. Solve :
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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#4042 2015-09-17 19:50:48
#4043 2015-09-17 23:26:58
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,422
Re: Oral puzzles
Hi zetafunc,
The solution is/are perfect! Neat work!
#2507. A sailor goes 8 kilometers downstream in 40 minutes and returns in 1 hour. Determine the speed of the sailor in still water and the speed of the 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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#4044 2015-09-18 01:11:51
#4045 2015-09-18 01:39:48
- 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
#4046 2015-09-18 01:47:01
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,422
Re: Oral puzzles
Hi zetafunc,
The solution #2507 is perfect! Exellent!
#2508. The sum of the numerator and the denominator of a fraction is 12. If the denominator is increased by 3, the fraction becomes 1/2. Find the fraction.
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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#4047 2015-09-18 01:54:22
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Oral puzzles
Hi;
Please check my answer for #2507.
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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#4048 2015-09-18 02:05:37
#4049 2015-09-18 06:26:53
- 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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#4050 2015-09-18 14:38:29
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,422
Re: Oral puzzles
Hi zetafunc, bobbym, and math9maniac,
bobbym - The solution #2507 is correct! Excellent!
zetafunc, bobbym, and math9maniac - The solution #2508 is correct! Good work!
#2509. A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, find the number of blue balls in the bag.
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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