Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #4101 2012-08-19 00:44:36

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

### Re: 10 second questions

Hi bobbym and Denominator,

The solutions

and

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #4102 2012-08-19 00:46:55

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,187

### Re: 10 second questions

Hi ganesh;

I got those in post #4100

Sorry, but what does proportional mean?

I don't really get this!

Hi Denominator;

Did you google for them? Are you just stuck on mean and third and fourth proportional or more basic than that?

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

## #4103 2012-08-19 01:04:25

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

### Re: 10 second questions

Hi bobbym and Denominator,

The solutions #4255 and #4256 are correct, bobbym! Excellent!

#4257. If \$782 is divided into three parts, proportional to 1/2 : 2/3 : 3/4, then the first part is __________________

#4258. If 76 is divided into four parts proportional to 7, 5, 3, 4, then the smallest part is _________________

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #4104 2012-08-19 01:10:21

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,187

### Re: 10 second questions

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

## #4105 2012-08-19 03:05:54

dlamacharles
Member
Registered: 2012-08-19
Posts: 3

### Re: 10 second questions

7, 14, 21, 28,....
a=7
d=7
n=?
Tn=98
Tn=a+(n-1)d
n=14

Offline

## #4106 2012-08-19 03:22:32

dlamacharles
Member
Registered: 2012-08-19
Posts: 3

### Re: 10 second questions

Proportion is a factor of equality.

Offline

## #4107 2012-08-19 19:21:58

Denominator
Member
Registered: 2009-11-23
Posts: 155

### Re: 10 second questions

Yeah, I understand what proportion is, but I just didn't understand it in the context of 4255 and 4256

Offline

## #4108 2012-08-19 20:38:28

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,187

### Re: 10 second questions

Hi;

http://www.vitutor.com/arithmetic/ratio … ional.html

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

## #4109 2012-08-20 00:51:01

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

### Re: 10 second questions

Hi bobbym and Denominator,

The solutions #4257 and #4258 are correct. Excellent!

#4259. 85 kilograms of a mixture contains milk and water in the ratio 27 : 7. How much more water is to be added to get a new mixture containing milk and water in the ratio 3 : 1?

#4260. The ages of A and B are in the ratio 3 : 1. Fifteen years hence, the ratio would be 2 : 1. Find their present ages.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #4110 2012-08-20 07:57:31

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,187

### Re: 10 second questions

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

## #4111 2012-08-20 16:55:13

Denominator
Member
Registered: 2009-11-23
Posts: 155

Hello

Offline

## #4112 2012-08-21 00:55:09

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

### Re: 10 second questions

Hi bobbym and Denominator,

bobbym : The solution #4260 is correct. Well done!

Denominator : Both the solutions are correct. Excellent!

#4261. The speeds of three cars are in the ratio 5 : 4 : 6. The ratio in the time taken by them to travel the same distance is _________ .

#4262. In a college, the ratio of the number of boys to girls is 8 : 5. If there are 160 girls, what is the total number of students in the college?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #4113 2012-08-21 01:01:13

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,018

### Re: 10 second questions

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

## #4114 2012-08-21 01:05:51

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,187

### Re: 10 second questions

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

## #4115 2012-08-21 07:24:46

Denominator
Member
Registered: 2009-11-23
Posts: 155

### Re: 10 second questions

Hello

Last edited by Denominator (2012-08-21 07:25:41)

Offline

## #4116 2012-08-21 23:39:12

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

### Re: 10 second questions

Hi anonimnystefy, bobbym, and Denominator,

The solution #4261 and #4262 are correct. Excellent!

#4263. The ratio of the number of boys and girls in a school is 3 : 2. If 20% of the boys and 25% of the girls are scholarship holders, what percentage of the students does not get the scholarship?

#4264. In a school, 10% of the boys are same in number as 1/4 th of the girls. What is the ratio of boys to girls in that school?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #4117 2012-08-21 23:45:34

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,187

### Re: 10 second questions

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

## #4118 2012-08-22 07:17:30

Denominator
Member
Registered: 2009-11-23
Posts: 155

Hello

Offline

## #4119 2012-08-22 22:42:52

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

### Re: 10 second questions

Hi bobbym and Denominator,

Correct, bobbym! Good work!

The solution #4264 is correct, bobbym and Denominator! Neat work!

#4265. The ratio of the incomes of A and B is 5 : 4 and the ratio of their expenditures is 3 : 2. If at the end of the year, each saves \$1600, then the income of A is ____________

#4266. Zinc and copper are melted together in the ratio 9 : 11. What is the weight of melted mixture, if 28.8 kilograms of zinc has been consumed in it?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #4120 2012-08-22 22:49:49

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,187

### Re: 10 second questions

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

## #4121 2012-08-23 23:54:25

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

### Re: 10 second questions

Hi bobbym,

The solutions #4265 and #4266 are correct. Brilliant!

#4267. An alloy is to contain copper and zinc in the ratio 9 : 4. The zinc required to be melted with 24 kilograms of copper is _____________

#4268. 60 kg of an alloy A is mixed with 100 kg of alloy B. If alloy A has lead and tin in the ratio 3 : 2 and alloy B has tin and copper in the ratio 1 : 4, then the amount of tin in the new alloy is ________________

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #4122 2012-08-24 00:29:17

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,187

### Re: 10 second questions

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

## #4123 2012-08-24 23:36:01

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

### Re: 10 second questions

Hi bobbym,

The solutions #4267 and #4268 are perfect. Excellent!

#4269. Find the fourth proportional to 4, 9, 12.

#4270. Find the third proportional to 16 and 36.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #4124 2012-08-24 23:40:31

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,187

### Re: 10 second questions

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

## #4125 2012-08-26 00:14:05

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,812

### Re: 10 second questions

Hi bobbym,

The solutions #4269 and #4270 are correct. Good work!

#4271. A fruitseller sells mangoes at the rate of \$9 per kilogram and thereby loses 20%. At what price per kilogram, he should have sold them to make a profit of 5%?

#4272. A property dealer sells a house for \$630,000 and in the bargain makes a profit of 5%. Had he sold it for \$500,000, then what percentage of loss or gain he would have made?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline