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  1. #1

    Default Need help with a maths question

    ok im trying to rearrange:

    y=w x r x 0.0333 + w

    so that the subject is r but its been so long since i did maths i cant do it and i've been trying for a while now im a bit annoyed right now , has anyone got the time to teach me how to rearrange it?

  2. #2

    Default Re: Need help with a maths question

    Its just order of operations

    1.) Move w to the otherside

    y-w = w x r x 0.0333

    2.) Divide by w and the constant

    (y-w) /(wx0.0333) = r

    3.) flip it if you want to make it look more conventional

    r = (y-w) /(wx0.0333)

    Though I am not 100% sure if this is what you mean by the "subject". This is the form of making r the dependent, or in other words writing r in terms of y and w. You could also divide out the w in the denominator but that is not necissarily a simplier form, though it is more elegant in this case:

    r = 30(y/w - 1)
    Last edited by Sphere; November 23, 2010 at 02:52 PM.

  3. #3
    Agent Miles's Avatar Tiro
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    Default Re: Need help with a maths question

    Subtract w from both sides and then divide both sides by 0.0333w. Then r equals y-w divided by 0.333 w.
    (beaten by one minute)
    An army of rabbits led by a lion will always overcome an army of lions led by a rabbit. Napoleon

  4. #4

    Default Re: Need help with a maths question

    -w both sides

    × 1/w

    × 1/0.0333


    Edit: Argh dammit, this doesn't support the insert equation function

    In a way Agent Miles is *more* correct. Once you think in terms of you are doing, is to do to both sides equally, algebra becomes a lot easier.
    Last edited by Plant; November 23, 2010 at 03:14 PM.
    Smilies...the resort of those with a vacuous argument

  5. #5
    Vanoi's Avatar Dux Limitis
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    Default Re: Need help with a maths question

    math is so hard. btw what kind of math is that? Algebra?

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