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**BarandaMan****Guest**

Need to solve:

Maximise (8/3)P1 + 8P2 + 8P3 + 10P4 subject to........

1. (4/3)P1+6P2>(or equal to, for all) 2P1 + 5P2 .... SO P1 < (3/2) P2.

2. 2P3 + 5P4 > (4/3)P3 + 6P4.....so P4 < (2/3)P3

3. (4/3)P1 + 6P3 > 2P1 + 5P3....SO P1<(3/2)P3

3. 2P2 + 5P4 > (4/3) P2 + 6P4.....SO P4 < (2/3) P2

PLEASE help me solve this. How do I do it? What do you get? Help help help!

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,726

Hi BarandaMan;

Looks like a linear programming problem. Have you studied them yet?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**BarandaMan****Guest**

Unfortunately not, but it seems from my experience we are not meant to have...it is a very small part of the question (At the end)but obviously it is a big new thing to learn.

How can I solve this? Thanks bobbym

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,726

Hi;

Is this the problem?

Please check the constraints carefully!

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**BarandaMan****Guest**

Yes:P this is correct

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,726

Hi;

Without even talking about a possible method of solution I am having a problem right there. I am getting no maximum with those constraints. Have you copied the problem exactly?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**BarandaMan****Guest**

I forgot to add that, 0 is less than or equal to each P which is less than or equal to 1. and P1+P2+P3+P4=1. Does this help? :d

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,726

Hi;

Are those the last of the constraints?

With those I can get a maximum of

when

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**BarandaMan****Guest**

YAY!!!

Ok, I got the same answer, but basically by using the 'fixed formula' for the type of question we had which we were told in class.

I just want to know HOW i would solve this using the inequalities so that I know I can really do this without memorizing a formula...if that makes sense. Please can you show me how to solve this?

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,726

I did it by computer. It was too complicated to be done by hand. If you have a fixed formula, please post it.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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