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Perform maths based on a number in a text file

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I'm tyring to simplify the design of a web site which uses PHP, and hope someone can help me.  Basically I want to store a number in a file on a web site, and display that number, or a variation of it, on a number of web pages. Let's say the parameter is "A", and is 10 ps. Three different web pages need to display this number, but in 3 different ways. 

1) First page shows just A
2) Second page multiples A by 3
3) Third page multiples A by -2

So if A was 10

1) Page 1 should show 10
2) Page 2 should show 30
3) Page 3 should show -20. 

If the value of A changes, I'd like to update the web site in one place, and not go around to every page updating them individually, as that will be error prone. 

Is there a way to put the value of A in a text file, and use the value in different parts of the site? If so how? 

Since there will actually be 15 or so parameters, A, B, C ..., is there a way I can put all 15 parameters in a file (perhaps one per line, or with white space between them), rather than have 15 different files? 

If you look at this web page which is for an economimcal / low cost vector network analyzer kit, 

http://www.vnacalibration.co.uk/support/85033/Rohde+Schwarz/

you can see the numeric values in the form used by Rohde & Schwarz for their vector network analyzers, whereas in this page which is a bit longer, under the section "Standard Definitions", 

http://www.vnacalibration.co.uk/support/85033/HP/

one has basicaly the same parameters, but expressed in a different way. Another make of vector network analyzer wants the parameters in a different way. 

Any thoughts? 

Dave 

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Perform maths based on a number in a text file drkirkby@gmail.com - 2013-11-18 01:23 -0800
  Re: Perform maths based on a number in a text file Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-18 11:57 +0100
  Re: Perform maths based on a number in a text file The Natural Philosopher <tnp@invalid.invalid> - 2013-11-18 13:19 +0000
    Re: Perform maths based on a number in a text file Tim Streater <timstreater@greenbee.net> - 2013-11-18 15:08 +0000
      Re: Perform maths based on a number in a text file The Natural Philosopher <tnp@invalid.invalid> - 2013-11-18 16:22 +0000
        Re: Perform maths based on a number in a text file Ben Bacarisse <ben.usenet@bsb.me.uk> - 2013-11-18 16:50 +0000
        Re: Perform maths based on a number in a text file Tim Streater <timstreater@greenbee.net> - 2013-11-18 16:53 +0000
    Re: Perform maths based on a number in a text file drkirkby@gmail.com - 2013-11-20 03:50 -0800
      Re: Perform maths based on a number in a text file David Robley <me@home.invalid> - 2013-11-20 22:32 +1030
      Re: Perform maths based on a number in a text file The Natural Philosopher <tnp@invalid.invalid> - 2013-11-20 13:03 +0000
      Re: Perform maths based on a number in a text file Jerry Stuckle <jstucklex@attglobal.net> - 2013-11-20 11:20 -0500
  Re: Perform maths based on a number in a text file Ben Bacarisse <ben.usenet@bsb.me.uk> - 2013-11-18 14:46 +0000
    Re: Perform maths based on a number in a text file drkirkby@gmail.com - 2013-11-20 03:53 -0800
  Re: Perform maths based on a number in a text file Jerry Stuckle <jstucklex@attglobal.net> - 2013-11-18 11:38 -0500
    Re: Perform maths based on a number in a text file drkirkby@gmail.com - 2013-11-20 03:58 -0800
  Re: Perform maths based on a number in a text file Denis McMahon <denismfmcmahon@gmail.com> - 2013-11-21 03:10 +0000

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