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Math Help - Finding same unknown in 2 equations

  1. #1
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    Finding same unknown in 2 equations

    Hi everyone,

    I am a little stumped as how I find 'B' in the equation below, in the text of the answers we are given 'B = 227.442' and if you enter that into the formula it comes out as the correct answer but how do I go about extracting it?

    The formula is

    (8 x 33405) + (9 x 25978) + (0.79B x 21460) + ((0.21B - 12.5) x 22707 = 5177297

    Any help would be greatly appreciated.

    Thanks in advance
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  2. #2
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    e^(i*pi)'s Avatar
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    Re: Finding same unknown in 2 equations

    Quote Originally Posted by Rastanking View Post
    Hi everyone,

    I am a little stumped as how I find 'B' in the equation below, in the text of the answers we are given 'B = 227.442' and if you enter that into the formula it comes out as the correct answer but how do I go about extracting it?

    The formula is

    (8 x 33405) + (9 x 25978) + (0.79B x 21460) + ((0.21B - 12.5) x 22707 = 5177297

    Any help would be greatly appreciated.

    Thanks in advance
    Simplify by expanding brackets

    267240 + 233802 + 16953.4B + 4768.47B - 283837.5 = 5177297

    Combine like terms and solve for B
    Last edited by e^(i*pi); January 14th 2012 at 07:35 AM. Reason: typo
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  3. #3
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    Re: Finding same unknown in 2 equations

    typo: that should be

    267240 + 233802 + 16953.4B + 4768.47B - 283837.5 = 5177297
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  4. #4
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    Re: Finding same unknown in 2 equations

    Many thanks for your swift response, think I've been staring at it too long!!
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