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

You are not logged in.

- Topics: Active | Unanswered

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,648

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,703

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. **

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,484

Hi ShivamS and bobbym,

The solutions #4975 and #4976 are correct. Marvelous!

#4977. If

and , find the value of .#4978. If a + b + c = 13,

, find the value ofab + bc + ca.

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: 105,703

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. **

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,484

Hi bobbym,

The solutions #4977 and #4978 are correct. Excellent!

#4979. If

and x + y = 3z, then find the value of z.#4980.

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: 16,016

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: 105,703

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. **

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,484

Hi anonimnystefy and bobbym,

The solution #4980 is perfect, anonimnystefy! Excellent!

bobbym, I made a mistake in the problem; regretted.

#4981.

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: 105,703

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. **

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,484

Hi bobbym,

The solution #4981 is perfect. Splendid!

#4982. Find the value of x

.#4983

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,703

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. **

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,484

Hi bobbym,

#4984. How many pieces of 85 cm length can be cut from a rod 42.5 meters long?

#4985.

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,703

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. **

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,484

Hi bobbym,

The solution [hide=#4984]I get 50.

Number of pieces = 42.5 x 100/85 = 4250/85 = 50

The solution #4985 is perfect. Exemplary!

PS : Thanks for the replies. I shall post 'English Language Puzzles' soon.

#4986.

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,703

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. **

Offline

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

Hello

Thanks

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,484

Hi bobbym and Denominator,

The solution #4986 is correct. Stupendous!

#4987. If

, then what is the value of?

#4988. Given

and ,find the value of .

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,703

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. **

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,484

Hi bobbym,

The solutions #4987 and #4988 are correct. Magnificent!

#4989.

#4990.

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,703

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. **

Offline

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,648

I need a little explanation on how 4990 can be done in about 10 seconds.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,703

It can be shortened algebraically but still required a calculator.

**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. **

Offline

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,648

Okay, because I thought I was missing something.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,703

I can not even write the problems down in less than a minute. 10 seconds, I am too slow for that.

**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. **

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,484

Hi bobbym and ShivamS,

I made a mistake owing to my poor vision. The problem actually stated:

#4990.

The corrected version :

#4990.

Inconvenience regretted!

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

Offline