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Math Help - [SOLVED] What's the original value of this percentage

  1. #1
    kps_uk
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    [SOLVED] What's the original value of this percentage

    Hi guys,

    I need to find the original value of X for a particular percentage of Y.

    Example

    If 65% of X = 100(being Y), what is X (for this example it's apx 155) but I need exact numbers.

    Cheers.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by kps_uk View Post
    Hi guys,

    I need to find the original value of X for a particular percentage of Y.

    Example

    If 65% of X = 100(being Y), what is X (for this example it's apx 155) but I need exact numbers.

    Cheers.
    first we need some vocabulary (vocabulary in math ?! yes, vocabulary in math).

    "Percent" is a fancy word for "out of 100" or "divided by 100." so 65% means 65/100

    in math, "of" means "multiply." so 65% of means "65/100 x"

    so now, rewrite the equation:

    we have: \frac {65}{100}x = 100

    Now solve for x
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  3. #3
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    Quote Originally Posted by kps_uk View Post
    Hi guys,

    I need to find the original value of X for a particular percentage of Y.

    Example

    If 65% of X = 100(being Y), what is X (for this example it's apx 155) but I need exact numbers.

    Cheers.

    In general,


     x % of y = z


    ( x % = x per cent = x per 100 = \frac{x}{100})

     \frac{x}{100} * y = z

    y = z*\frac{100}{x}

    Hope this helps

    Mahurshi Akilla
    Last edited by mahurshi; September 5th 2007 at 04:11 PM. Reason: trying out tex
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