Math Is Fun Forum

Abby ❤ Choco

Member

Registered: 2013-03-06

Posts: 5

Mean Values

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Mean Values

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.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,646

Re: Mean Values

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 (2013-03-06 10:25:21)

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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
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

Abby ❤ Choco

Member

Registered: 2013-03-06

Posts: 5

Re: Mean Values

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 :-)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Mean Values

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.

Abby ❤ Choco

Member

Registered: 2013-03-06

Posts: 5

Re: Mean Values

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

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Mean Values

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.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,646

Re: Mean Values

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 (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
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Mean Values

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.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,646

Re: Mean Values

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
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Mean Values

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.

Abby ❤ Choco

Member

Registered: 2013-03-06

Posts: 5

Re: Mean Values

Hey guys! I got it! Thanks again!
Will be posting for other horrid math problems soon!

Bob

Administrator

Registered: 2010-06-20

Posts: 10,646

Re: Mean Values

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

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
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Mean Values

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.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,646

Re: Mean Values

And that light sabre isn't just for show.

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
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

Abby ❤ Choco

Member

Registered: 2013-03-06

Posts: 5

Re: Mean Values

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

Bob

Administrator

Registered: 2010-06-20

Posts: 10,646

Re: Mean Values

hi

You know B = 50

and that A + B = 80

So A should be easy.

Similarly for C

Bob

Last edited by Bob (2013-03-06 21:43:37)

---

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
Sometimes I deliberately make mistakes, just to test you!  …………….Bob