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**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

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,665

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.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,393

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)*

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

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**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 :-)

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,665

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.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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

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

Thank you.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,665

Are you okay with those equations?

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,393

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)*

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

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,665

Hi;

Bob, she skedoodled out of the forum.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,393

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

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

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,665

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

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**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!

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,393

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

Bob

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,665

Tell your teachers I am watching them, closely.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,393

And that light sabre isn't just for show.

Bob

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**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?

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,393

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)*

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