Results 1 to 3 of 3

Math Help - Trying to figure out this word problem.

  1. #1
    Newbie
    Joined
    May 2007
    Posts
    19

    Trying to figure out this word problem.

    I can't wrap my head around the wording of this problem. I've figuring it out for a long time without getting anywhere. Can anyone shed some light? The highlighted choice (choice 4) is the answer.



    Thanks!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by thumpin_termis View Post
    I can't wrap my head around the wording of this problem. I've figuring it out for a long time without getting anywhere. Can anyone shed some light? The highlighted choice (choice 4) is the answer.



    Thanks!
    Let the original concentartions be A and B, then the rate:

    r = k A^2/B

    Let the new concentartions be A' and B', then as B' is 100% more than B,
    B'=2B, so if the rates befor and after are equal:

    A^2/B = A'^2/B' = A'^2/(2B),

    so A' = sqrt(2) A ~= 1.4 A, which is approximatly a 40% increase.

    RonL
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    May 2007
    Posts
    19
    Thanks for the explanation
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 3
    Last Post: October 21st 2010, 09:46 AM
  2. Replies: 2
    Last Post: June 4th 2010, 08:02 AM
  3. Replies: 2
    Last Post: October 1st 2009, 10:31 PM
  4. Word Problem. Can't figure out equation.
    Posted in the Algebra Forum
    Replies: 5
    Last Post: March 29th 2009, 11:54 PM
  5. use venn diagram to figure out word problem?
    Posted in the Discrete Math Forum
    Replies: 0
    Last Post: March 25th 2008, 12:48 PM

Search Tags


/mathhelpforum @mathhelpforum