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

You are not logged in.

- Topics: Active | Unanswered

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,334

Hi bobbym,

The solution #1552 is correct. Excellent!

#1553. Two right circular cylinders of equal volumes have their heights in the ratio 1:2. What is the ratio of their radii?

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: 105,325

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.****No great discovery was ever made without a bold guess. **

**Online**

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

Hello

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,334

Hi bobbym and Denominator,

The solution #1553 is perfect. Brilliant!

#1554. A well with 14 meters inside diameter is dug 10 meters deep. Earth taken out of it has been evenly spread all around it to a width of 21 meters to form an embankment. What is the height of the embankment? (Use pi = 22/7)

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: 105,325

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.****No great discovery was ever made without a bold guess. **

**Online**

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,325

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.****No great discovery was ever made without a bold guess. **

**Online**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,334

Hi bobbym,

The

.#1555. If (a + b) : (b + c) : (c + a) = 6:7:8 and (a + b + c) = 14, then find the value of 'c'.

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: 105,325

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.****No great discovery was ever made without a bold guess. **

**Online**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,334

Hi bobbym,

The solution #1555 is correct. Neat job!

#1556. $1210 is divided among A, B, and C so that A : B = 5 : 4 and B : C = 9 : 10. Then, how much does C gets?

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,325

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.****No great discovery was ever made without a bold guess. **

**Online**

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

Hello

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,334

Hi bobbym and Denominator,

The solution #1556 is perfect. Good work!

#1557. The salaries of Roger and Steve are in the ratio 2 : 3. If the salary of each is increased by $4000, the new ratio becomes 40 : 57. What is Steve's present salary?

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,325

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.****No great discovery was ever made without a bold guess. **

**Online**

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

Hello ganesh;

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,334

Hi bobbym and Denominator,

The solution #1557 is correct. Good work!

#1558. The third proportional to 0.36 and 0.48 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: 105,325

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.****No great discovery was ever made without a bold guess. **

**Online**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,334

Hi bobbym,

The

#1559. In a ratio, which is equal to 3 : 4, if the antecedent is 12, then the consequent 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: 105,325

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.****No great discovery was ever made without a bold guess. **

**Online**

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

Hello ganesh;

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,334

Hi bobbym and Denominator,

The solution #1559 is correct. Neat work!

#1560. If 2A = 3B = 4C, then A : B : C 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: 105,325

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.****No great discovery was ever made without a bold guess. **

**Online**

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

1. 45

2. 7

3. 120

4. 7 and 10

Offline

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

Hello

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,334

Hi bobbym and Denominator,

The solution #1560

Good work, Denominator!

#1561. The average age of three boys is 25 years and their ages are in the proportion 3 : 5 : 7. Find the age of the youngest boy.

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,325

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.****No great discovery was ever made without a bold guess. **

**Online**