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#1126 2011-07-29 17:16:16

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym,

The solution #1145 is correct. Well done!

#1146. A man rows downstream 32 km and upstream 14 km. If he takes 6 hours to cover each distance, then what is the velocity of the current (in km/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.

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#1127 2011-07-29 20:36:34

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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#1128 2011-07-30 00:48:25

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym,

The solution #1146 is perfect. Neat job!

#1147. Find the average of two-digit numbers, which remain the same when the digits interchange their positions.


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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#1129 2011-07-30 00:50:27

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Oral puzzles

Hi ganesh;

Two two digit numbers?


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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#1130 2011-07-30 17:09:23

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym,

#1148. If a, b, c, d, and e are five consecutive odd numbers, what is their average?


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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#1131 2011-07-30 17:15:09

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

#1132 2011-07-31 20:20:19

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym,

The solution #1148 is correct. Good work!

#1149. If the manufacturer gains 10 %, the wholesale dealer 15 % and the retailer 25 %, then find the cost of production of a table, the retail price of which is $1265.


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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#1133 2011-07-31 22:12:08

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

#1134 2011-08-01 00:40:05

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym,

The solution #1149 is correct. Good work!

#1150. In an examination, 35% of total students failed in Hindi, 45% failed in English, and 20% in both. Find the percentage of those who passed in both the 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.

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#1135 2011-08-01 00:44:39

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

#1136 2011-08-01 00:45:46

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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#1137 2011-08-01 01:19:53

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym and anonimnystefy,

The solution #1150 is correct. Neat job!

#1151. In an examination, 80% of the students passed in English, 85% in Mathematics, and 75% in both English and Mathematics. If 40 students failed in both the subjects, find the total number of students.


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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#1138 2011-08-01 01:28:24

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

#1139 2011-08-02 00:55:06

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym,

The solution #1151 is perfect. Good work!

#1152. How many kg of pure salt must be added to 30 kg of 2% solution of salt and water to increase it to a 10% solution?


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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#1140 2011-08-02 00:59:48

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

#1141 2011-08-02 17:40:39

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym,

The solution #1152 is correct. Neat job!

#1153. A triangle has vertices A (1,-1), B (-1,1), and C (1,1). Find the slope of the median through C.


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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#1142 2011-08-02 18:04:41

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

#1143 2011-08-03 00:31:06

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym,

The solution #1153 is correct. Neat job!

#1154. If the points (4,1), (-2,-3), and (x,-5) are collinear, find 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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#1144 2011-08-03 00:43:49

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

#1145 2011-08-03 17:11:26

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym,

The solution #1154 is correct. Good work!

#1155. A (2,3), B (0,4), and C (-5,0) are the given points. Find the slope of the line passing through B and the midpoint of AC.


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

#1146 2011-08-03 17:24:34

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

#1147 2011-08-04 00:41:33

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi bobbym,

The solution #1155 is correct. Good work!

#1156. The line joining A (-2,4) and B (3,-5) is parallel to the line joining C (0,4) and D (-3,y). Find 'y'.


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

#1148 2011-08-04 00:44:57

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

#1149 2011-08-04 01:17:21

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,429

Re: Oral puzzles

Hi anonimnystefy,

The solution #1156 is correct. Good work!

#1157. The line joining A (-4,6) and B (-1,-3) is perpendicular to the line joining C (0,-4) and D (3,a). Find a.


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

#1150 2011-08-04 01:53:57

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

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