Results 1 to 4 of 4

Math Help - Trouble with a number prob.

  1. #1
    Newbie
    Joined
    Oct 2006
    Posts
    2

    Trouble with a number prob.

    Two numbers add up to 43. Four times the first is four more than twice the second. What are the numbers? Im stuck on this one, lol. Any help would be awesome, thanks.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member Glaysher's Avatar
    Joined
    Aug 2006
    From
    Newton-le-Willows
    Posts
    224

    Red face

    Quote Originally Posted by Nate View Post
    Two numbers add up to 43. Four times the first is four more than twice the second. What are the numbers? Im stuck on this one, lol. Any help would be awesome, thanks.
    Call one number x
    Then the other is 43 - x as they add up to 43

    Four times the first is 4x

    Twice the second is 2(43 - x) = 86 - 2x
    Then 4 more is 86 - 2x + 4 = 90 - 2x

    So 4x = 90 - 2x

    6x = 90

    x = 15
    43 - x = 28
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Oct 2006
    Posts
    2

    Thanks that helped alot

    Thats so easy now. Thanks so much for the help; grately appreciated.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Global Moderator

    Joined
    Nov 2005
    From
    New York City
    Posts
    10,616
    Thanks
    9
    Quote Originally Posted by Nate View Post
    Two numbers add up to 43. Four times the first is four more than twice the second. What are the numbers? Im stuck on this one, lol. Any help would be awesome, thanks.
    x+y=43
    4x=2y+4

    In first equation subtract 'y' from both sides:
    x=43-y

    In second equation substitute 'x' from first equation:
    4(43-y)=2y+4

    Simplify by dividing by 2,
    2(43-y)=y+2

    Open parantheses,
    86-2y=y+2

    Add '2y' to both sides,
    86=3y+2

    Subtract 2 from both sides,
    84=3y

    Divide by 3,
    y=28

    Then,
    x=43-y=43-28=15
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 4
    Last Post: April 28th 2011, 06:20 AM
  2. Replies: 2
    Last Post: April 12th 2011, 10:13 AM
  3. geo prob?
    Posted in the Geometry Forum
    Replies: 2
    Last Post: September 16th 2009, 03:22 AM
  4. Replies: 2
    Last Post: December 18th 2008, 05:28 PM
  5. Prob Qn'
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: April 10th 2008, 11:51 PM

Search Tags


/mathhelpforum @mathhelpforum