Results 1 to 8 of 8

Math Help - Percentages

  1. #1
    Newbie
    Joined
    Jan 2011
    Posts
    4

    Percentages

    If in a survey 33% of people preffered somethnig and 67% didnt, then one more person voted changing this result to 25% preffered and 75% not preffered (the one person making 8% difference) how many people wouldve voted? any help would be appreciated
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor alexmahone's Avatar
    Joined
    Oct 2008
    Posts
    1,074
    Thanks
    7
    Let the number of people initially be x.

    \frac{0.33x}{0.67x+1}=\frac{25}{75}

    Can you proceed?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jan 2011
    Posts
    4
    im still not sure how many people it would have been
    Follow Math Help Forum on Facebook and Google+

  4. #4
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    In post 2 alexmahone has used x to denote the number of people.

    If you solve that equation for x then you will work out the number of people it would have been
    Follow Math Help Forum on Facebook and Google+

  5. #5
    MHF Contributor alexmahone's Avatar
    Joined
    Oct 2008
    Posts
    1,074
    Thanks
    7
    I think the 33% and 67% are merely approximations to \frac{1}{3} and \frac{2}{3}.

    \frac{\frac{x}{3}}{\frac{2}{3}x+1}=\frac{25}{75}=\  frac{1}{3}

    x=\frac{2}{3}x+1

    \frac{x}{3}=1

    x=3
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Jan 2011
    Posts
    4
    so it would have been 1 person for and 3 against? or 1 and 2 then 1 and 3? ( the person that made it 25% and 75% and voted agaisnt)
    Follow Math Help Forum on Facebook and Google+

  7. #7
    MHF Contributor alexmahone's Avatar
    Joined
    Oct 2008
    Posts
    1,074
    Thanks
    7
    Quote Originally Posted by Revxx View Post
    so it would have been 1 person for and 3 against? or 1 and 2 then 1 and 3? ( the person that made it 25% and 75% and voted agaisnt)
    First, 1 against 2. Later, 1 against 3.
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Newbie
    Joined
    Jan 2011
    Posts
    4
    thankyou very much for your help
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. please help percentages
    Posted in the Statistics Forum
    Replies: 1
    Last Post: March 2nd 2010, 03:58 AM
  2. percentages
    Posted in the Math Topics Forum
    Replies: 6
    Last Post: February 5th 2010, 08:50 AM
  3. A little help with percentages!
    Posted in the Algebra Forum
    Replies: 1
    Last Post: November 19th 2009, 03:02 PM
  4. help with percentages????
    Posted in the Algebra Forum
    Replies: 4
    Last Post: August 26th 2009, 10:58 PM
  5. percentages - I can't do this...
    Posted in the Algebra Forum
    Replies: 2
    Last Post: January 15th 2009, 08:36 PM

Search Tags


/mathhelpforum @mathhelpforum