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

You are not logged in.

- Topics: Active | Unanswered

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

Oh, I see why I got it wrong, thanks!

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,104

Hi bobbym and Denominator,

The solutions #4237 and #4238 are correct. Neat work!

#4239. What is the ratio of total surface area to lateral surface area of a cylinder whose radius is 20 cm and height 60 cm?

#4240. A powder tin has a square base with side 8 cm and height 14 cm. Another tin has a circular base with diameter 8 cm and height 14 cm. Find the difference of their capacities.

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

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,846

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.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,104

Hi bobbym,

The solutions #4239 and #4240 are correct. Excellent!

#4241. The radius of the cylinder is half its height and area of the inner part is 616 sq.cms. Approximately how many liters of milk can it contain?

#4242. The sum of the radius of the base and the height of a solid cylinder is 37 meters. If the total surface area of the cylinder be 1628 square meters, what is its volume?

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

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,846

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.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,104

Hi bobbym,

The solution #4242 is correct. Excellent!

#4243. If the radius of the base of a right circular cylinder is halved, keeping the height same, what is the ratio of the volume of the reduced cylinder to that of the original one?

#4244. The radii of two cylinders are in the ratio of 2:3 and their heights are are in the ratio of 5:3. What is the ratio of their volumes?

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

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,846

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.**

Offline

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

Hello

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,104

Hi bobbym and Denominator,

The solutions #4243 and #4244 are correct. Excellent!

#4245. The radius of wire is decreased to one-third and its volume remains the same. The new length is how many times the original length?

#4246. A cylindrical tank of diameter 35 cm is full of water. If 11 liters of water is drawn off, the water level in the tank would drop by what level?

(Use pi = 22/7)

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

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,015

Hi ganesh

*Last edited by anonimnystefy (2012-08-13 00:03:04)*

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

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,846

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.**

Offline

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

Hi

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,104

Hi anonimnystefy, bobbym, and Denominator,

The

and Well done, the solution #4245 is correct, bobbym and Denominator!#4247. If x/5 = y/8, then (x + 5) : (y + 8) is equal to what ratio?

#4248. If a/3 = b/4 = c/7, then (a + b + c)/c is equal to what?

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,846

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.**

Offline

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

Hello ganesh;

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,104

Hi bobbym and Denominator,

The solutions #4247 and #4248 are correct. Good work!

#4249. Two numbers are in the ratio 3 : 5. If 9 is subtracted from each, the new numbers are in the ratio 12 : 23. Find the smaller number.

#4250. Two numbers are in the ratio 1 : 2. If 7 is added to both, their ratio changes to 3 : 5. Find the greatest number.

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,846

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.**

Offline

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

Hello

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,104

Hi bobbym and Denominator,

The solutions #4249 and #4250 are correct. Neat job!

#4251. The ratio of three numbers is 3 : 4 : 5 and the sum of their squares is 1250. What is the sum of the numbers?

#4252. The ratio of three numbers is 3 : 4 : 7 and their product is 18144. Find the numbers.

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,846

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

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

Hello

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,104

Hi bobbym and Denominator,

The solutions

andExcellent, bobbym!

#4253. The fourth proportional to 5, 8, 15 is ____________

#4254. The mean proportional between 234 and 104 is _____________

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,846

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.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,104

Hi bobbym,

The solutions #4253 and #4254 are correct. Neat work!

#4255. The third proportional to (x[sup]2[/sup] - y[sup]2[/sup]) and (x - y) is __________________

#4256. The ratio of third proportional to 12 and 30 and the mean proportional between 9 and 25 is ________________

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,846

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.**

Offline