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

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**Abby ❤ Choco****Member**- Registered: 2013-03-06
- Posts: 5

Please show me the solution and explain.

The mean of A and B is 40

The mean of B and C is 35

A +B+C=100

Calculate the values of A,B and C

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,123

Hi;

A = 30

B = 50

C = 20

Welcome to the forum.

Easiest solution is by setting up 3 simultaneous equations and solving them.

*Last edited by bobbym (2013-03-06 10:21:18)*

**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

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,738

hi Abby ❤ Choco

Welcome to the forum.

I would do this:

adding gives

After which it should be easy enough to get A and C.

Cool user name by the way!

Bob

*Last edited by bob bundy (2013-03-06 10:25:21)*

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**Abby ❤ Choco****Member**- Registered: 2013-03-06
- Posts: 5

Hi Admin Bob. Sorry but the answer you posted was incomplete or blank after "adding gives"... Which still left me pondering as how you got the values of A B and C. I'm still in Yr6 here in UK you see so I need a detailed solution. My Dad is helping me with this forum but unfortunately cannot help me with the math problems :-)

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,123

Can you solve the set of equations? Do you need help there?

**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

**Abby ❤ Choco****Member**- Registered: 2013-03-06
- Posts: 5

Ok weird but your solution has come up after I posted the remark.

Thank you.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,123

Are you okay with those equations?

**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

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,738

I suspect three simultaneous equations is a bit tough for Abby.

Give her a year or two on the forum and she'll be fine.

Hope you have got there now, Abby

Bob

ps. Now why didn't I think of that user name? really cool.

*Last edited by bob bundy (2013-03-06 10:48:12)*

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,123

Hi;

Bob, she skedoodled out of the forum.

**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

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,738

She got what she wanted. I think she'll be back next time her 'horrid' teachers set another nasty one. (Don't forget; I know what an evil bunch they are )

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,123

Teachers are always doing that. Trying to force someone to think. It is evil and soon will be outlawed.

**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

**Abby ❤ Choco****Member**- Registered: 2013-03-06
- Posts: 5

Hey guys! I got it! Thanks again!

Will be posting for other horrid math problems soon!

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,738

Looking forward to it. bye for now, sleep well.

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,123

Tell your teachers I am watching them, closely.

**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

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,738

And that light sabre isn't just for show.

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**Abby ❤ Choco****Member**- Registered: 2013-03-06
- Posts: 5

I'm back and I need to know how to get the value of A and C? What is the equation for getting it?

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,738

hi

You know B = 50

and that A + B = 80

So A should be easy.

Similarly for C

Bob

*Last edited by bob bundy (2013-03-06 21:43:37)*

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

Pages: **1**