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: 22,073

Hi bobbym and anonimnystefy,

The solutions #4221 and #4222 are correct. Excellent!

#4223. A can do a piece of work in 20 days and B can do it in 30 days. How long would they take to do it working together?

#4224. A an do a piece of work in 6 days. A and B together can do the work in 4 days. How long would it take B to finish the work?

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: 107,792

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

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

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

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 22,073

Hi bobbym and anonimnystefy,

The solutions #4223 and #4224 are correct. Neat work!

#4225. A and B together can reap a field in 10 hours, but by himself B requires 15 hours. How long would A take to reap the same field?

#4226. A and B can do a piece of work in 18 days, B and C in 24 days, and A & C in 36 days. In what time would they do it all working together?

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

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

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

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,792

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

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 22,073

Hi anonimnystefy and bobbym,

The solutions #4225 and #4226 are correct. Excellent!

#4227. A train running at the average speed of 45 kilometers per hour passes an electric pole in 10 seconds. Find the length of the train.

#4228. Length of the train is 500 meters. If the speed is 60 kilometers per hour, then find the time to cross a pole.

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: 107,792

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

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

Hi ganesh

And congrats on 10000 posts.

*Last edited by anonimnystefy (2012-07-31 23:56:09)*

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

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

Hello!

I don't like trains >_<

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 22,073

Hi bobbym, anonimnystefy, and Denominator,

The solutions #4227 and #4228 are correct. Neat job! (Denominator, the solution #4227 is 125 meters, not 1250 meters).

Thanks a lot, anonimnystefy (On 10,000 posts)!

#4229. A cistern can be filled by tap A in 4 hours and B in 3 hours. How long would it take to fill if both taps are opened together?

#4230. Pipe A can fill a tank in 5 hours, pipe B in 10 hours, and C in 30 hours. If all the pipes are open, in how many hours would the tank be filled?

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,792

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

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

Hi ganesh

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

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 22,073

Hi bobbym and anonimnystefy,

The solutions #4229 and #4230 are correct. Good work!

#4231. Find the Simple Interest on $1500 for 3 years at 10% per annum.

#4232. At what rate per annum would $5200 earn $624 in 2 years?

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,792

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

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

Hey

Yeah I must have added an extra zero in my working somewhere XD, sorry!

*Last edited by Denominator (2012-08-03 15:58:53)*

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 22,073

Hi bobbym and Denominator,

bobbym : The solution #4231

Denominator : All correct. Outstanding!

#4233. Find the missing figures. ?% of 25 = 2.125

#4234. Find the missing figures. 9% of ? = 63

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,792

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

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

Hey ganesh

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 22,073

Hi bobbym and Denominator,

The solutions #4233 and #4234 are correct. Neat job!

#4235. Which is greatest in 16 2/3%, 2/15, and 0.17?

#4236. A inspector rejects 0.08% of the meters as defective. How many will he examine to reject 2?

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,792

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

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

Hi ganesh,

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 22,073

Hi bobbym and Denominator,

Both the solutions #4235 and #4236 are perfect, bobbym! Good work!

Denominator, the solution #4235 is correct. Well done!

#4237. 88% of 370 + 24% of 210 - ? = 118

#4238. 860% of 50 + 50% of 860 = ?

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,792

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

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

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

Offline