Results 1 to 4 of 4

Math Help - Ratio and Proportion. The bigger plus two times the smaller number is equal to 42

  1. #1
    Newbie
    Joined
    Feb 2011
    Posts
    8

    Ratio and Proportion. The bigger plus two times the smaller number is equal to 42

    The ration between 2 numbers is -\frac{3}{8}. If the bigger numer plus two times the smaller number is equal to 42, find out the bigger number value.


    \frac{x}{y} = -\frac{3}{8}

    -3y=8x
    y = -\frac{8x}{3} x = \frac{-3y}{8}

    How do I find out which one is the bigger? obviously 3 is smaller than 8, but, couldn't it be the number 3 positive and the number 8 negative, therefore number 3 could be bigger than 8?

    Thanks for the help in advance.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Jun 2009
    Posts
    806
    Thanks
    4
    For the time being forget the negative sign.

    Let the fraction be \frac{3x}{8x}

    Here 8x is greater than 3x. Now proceed.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Feb 2011
    Posts
    8
    x = -\frac{3y}{8}

    y+2x=42

    y+2.\frac{-3y}{8}=42

    y=168

    Thats the answer, but still didn't understand how could I know for SURE which one is bigger.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member
    Joined
    Jun 2009
    Posts
    806
    Thanks
    4
    While considering the ratio you have to consider whether it is more than 1 or less than 1. From that you have decide which number is larger. You should not place the numbers on the number line to decide which one is larger.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Which number is bigger
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: December 21st 2010, 12:57 PM
  2. Help about ratio and proportion
    Posted in the Business Math Forum
    Replies: 2
    Last Post: May 31st 2010, 01:10 PM
  3. ratio and proportion
    Posted in the Statistics Forum
    Replies: 1
    Last Post: March 8th 2010, 11:51 AM
  4. Ratio and proportion 2
    Posted in the Algebra Forum
    Replies: 1
    Last Post: October 17th 2009, 06:57 AM
  5. Two balls such that the bigger one is contained inside the smaller
    Posted in the Differential Geometry Forum
    Replies: 6
    Last Post: September 20th 2009, 03:16 PM

/mathhelpforum @mathhelpforum