Results 1 to 2 of 2

Math Help - Algebra writing equations

  1. #1
    Sean.A.C
    Guest

    Algebra writing equations

    Taken from practise exam:


    QUESTION SIX
    Peter has more than twice as many CDs as Mary.
    Altogether they have 97 CDs.

    Write a relevant equation, and use it to find the least number of CDs that Peter could have.

    Least number of CDs that Peter could have =

    Please explain how I would write an equation to make sence of this. I don't have a clue.

    Thanks
    Sean
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Bar0n janvdl's Avatar
    Joined
    Apr 2007
    From
    Meh
    Posts
    1,630
    Thanks
    6
    Quote Originally Posted by Sean.A.C View Post
    Taken from practise exam:


    QUESTION SIX
    Peter has more than twice as many CDs as Mary.
    Altogether they have 97 CDs.

    Write a relevant equation, and use it to find the least number of CDs that Peter could have.

    Least number of CDs that Peter could have =

    Please explain how I would write an equation to make sence of this. I don't have a clue.

    Thanks
    Sean
    Let Peter's amount of CDs =  x
    Let Mary's amount of CDs =  y

    Peter has more than twice as many CDs as Mary
     y > 2x --- (1)

    Altogether they have 97 CDs
     x + y = 97

    Set  x = 97 - y into ---(1)

     y > 2(97 - y)

     y > 194 - 2y

     3y > 194

     y > 64 \ CDs \ (Approx.)

    Peter should have at least 65 CDs.
    Last edited by janvdl; July 13th 2007 at 03:44 AM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Writing Equations
    Posted in the Algebra Forum
    Replies: 7
    Last Post: December 7th 2011, 06:38 PM
  2. writing equations
    Posted in the Number Theory Forum
    Replies: 2
    Last Post: April 13th 2010, 01:26 PM
  3. writing equations
    Posted in the Number Theory Forum
    Replies: 2
    Last Post: April 10th 2010, 06:47 PM
  4. writing equations
    Posted in the Number Theory Forum
    Replies: 1
    Last Post: April 10th 2010, 01:33 PM
  5. Writing equations
    Posted in the Algebra Forum
    Replies: 1
    Last Post: June 17th 2009, 05:39 PM

Search Tags


/mathhelpforum @mathhelpforum