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#1176 2011-08-10 17:41:08

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

Re: Oral puzzles

Hi anonimnystefy and bobbym,

The solution #1167 is perfect. Well done!

#1168. The average of a non-zero number and its square is 5 times the number. Find the 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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#1177 2011-08-10 20:20:22

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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#1178 2011-08-10 20:39:01

Denominator
Member
Registered: 2009-11-23
Posts: 220

Re: Oral puzzles


koko28.png

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#1179 2011-08-11 00:29:22

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

Re: Oral puzzles

Hi bobbym and Denominator,

The solution #1168 is correct. Well done!

#1169. The average of 7 consecutive numbers is 20. Find the largest of these 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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#1180 2011-08-11 00:32:49

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.

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#1181 2011-08-11 07:36:26

Denominator
Member
Registered: 2009-11-23
Posts: 220

Re: Oral puzzles


koko28.png

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#1182 2011-08-11 08:26:22

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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#1183 2011-08-11 17:50:17

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

Re: Oral puzzles

Hi bobbym, Denominator, and anonimnystefy,

The solution #1169 is correct. Well done!

#1170. If log[sub]x[/sub]y = 100 and log[sub]2[/sub]x = 10, then what is the value of 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.

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#1184 2011-08-11 18:59:36

Denominator
Member
Registered: 2009-11-23
Posts: 220

Re: Oral puzzles


koko28.png

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#1185 2011-08-11 19:18:07

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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#1186 2011-08-12 00:50:20

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

Re: Oral puzzles

Hi Denominator and bobbym,

The

.

Well done, bobbym! Good attempt, Denominator!

#1171. A and B undertake to do a peice of work for $600. A alone can do it in 6 days while B alone can do it in 8 days. With the help of C, they finish it in 3 days. Find the share of each.


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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#1187 2011-08-12 01:06:27

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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#1188 2011-08-12 08:18:28

Denominator
Member
Registered: 2009-11-23
Posts: 220

Re: Oral puzzles

Sorry, I had to do this on paper (I hope you don't mind)
I'm new to these kinds of questions
Using what bobby told me...


koko28.png

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#1189 2011-08-12 16:56:28

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

Re: Oral puzzles

Hi bobbyn and Denominator,

The solution #1171 is perfect. Neat job!

#1172. If

, x and y being positive whole numbers, then find the values of x and y respectively.


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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#1190 2011-08-12 17:23:20

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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#1191 2011-08-12 18:56:26

Denominator
Member
Registered: 2009-11-23
Posts: 220

Re: Oral puzzles


koko28.png

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#1192 2011-08-12 21:50:37

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

Re: Oral puzzles

Hi bobbym and Denominator,

The solution #1172 is perfect. Good work!

#1173. If the wages of 6 men for 15 days be $2100, then find the wages of 9 men for 12 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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#1193 2011-08-12 22:52:08

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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#1194 2011-08-13 07:31:30

Denominator
Member
Registered: 2009-11-23
Posts: 220

Re: Oral puzzles


koko28.png

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#1195 2011-08-13 17:28:24

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

Re: Oral puzzles

Hi bobbym and Denominator,

The solution #1173 is correct. Well done!

#1174. In measuring the sides of a rectangle, one side is taken 5% in excess, and the other 4% in deficit. Find the error percent in the area calculated from these measurements.


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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#1196 2011-08-13 17:50:18

Denominator
Member
Registered: 2009-11-23
Posts: 220

Re: Oral puzzles

I'm not so confident with my answer...


koko28.png

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#1197 2011-08-13 19:47:06

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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#1198 2011-08-13 21:42:21

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

Re: Oral puzzles

Hi Denominator and bobbym,

The solution #1174 is perfect. Neat job!

#1175. If each side of a square is increased by 25%, find the percentage change in its area.


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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#1199 2011-08-13 21:57:17

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

#1200 2011-08-14 01:39:08

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

Re: Oral puzzles

Hi bobbym,

The solution #1175 is correct. Well done! [The exact percentage increase is 56.25%].

#1176. Find the length of the altitude of an equilateral triangle of side

cm.


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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