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Math Help - Basic Problem

  1. #1
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    Basic Problem

    I am struggling to see where the 1/3 comes from in front of the equation below, could anyone tell me why it is there please. The only correlation I can make is becuase there are 3 terms, is this correct?

    Iv = 2(12 x 113.4^3) / 12 + (400 x 36.6^3) / 12 - (376 x 24.6^3) / 12

    Iv = 1/3 ( 35000000 + 19610000 - 5597000)

    I know how the figures are calculated but don't know why the 1/3 comes from and why.

    Thanks in advance
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  2. #2
    MHF Contributor
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    Re: Basic Problem

    To make the second right-hand side expression equal the first one, 1/3 should be replaced by 1/12.
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  3. #3
    MHF Contributor

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    Re: Basic Problem

    In other words, what you have is incorrect. (Even with 1/12 rather than 1/3, the first term is equal to 35000000 only to three places.)
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  4. #4
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    Re: Basic Problem

    I believe that there is an error on the paper that I'm using, not good for a university handout!!
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