Results 1 to 8 of 8

Math Help - Worded problem - price of apples and oranges.

  1. #1
    Newbie
    Joined
    Dec 2011
    Posts
    5

    Worded problem - price of apples and oranges.

    Im not so good at math, but i have a question thet i know the answer too, but i think i have made a wrong way:
    an apple = 2 kr (thats the danish valuta)
    an orange = 4 kr
    I have bought 32 pices for 104 kr
    how many oranges have i bought?

    I now that he have bought 20 oranges and 12 appels
    but do anyone know an easier way i could have gotten to this answer?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member
    Joined
    Nov 2011
    From
    Crna Gora
    Posts
    420
    Thanks
    64

    Re: Wrong way?

    Quote Originally Posted by anders2200 View Post
    Im not so good at math, but i have a question thet i know the answer too, but i think i have made a wrong way:
    an apple = 2 kr (thats the danish valuta)
    an orange = 4 kr
    I have bought 32 pices for 104 kr
    how many oranges have i bought?

    I now that he have bought 20 oranges and 12 appels
    but do anyone know an easier way i could have gotten to this answer?
    You have to solve following system of equations :

    \begin{cases}2x+4y=104 \\x+y=32\end{cases}

    where y is number of oranges and x is number of apples
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Dec 2011
    Posts
    5

    Re: Wrong way?

    But how can this give the answer 20 (the number of oranges he bought)?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Senior Member
    Joined
    Nov 2011
    From
    Crna Gora
    Posts
    420
    Thanks
    64

    Re: Wrong way?

    Quote Originally Posted by anders2200 View Post
    But how can this give the answer 20 (the number of oranges he bought)?
    First divide first equation by 2 then substitute  x with 32-y so you should get equation:

    32-y+2y=52
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Dec 2011
    Posts
    5

    Re: Wrong way?

    So if you could write it down step by step how would you have done that?
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Senior Member
    Joined
    Nov 2011
    From
    Crna Gora
    Posts
    420
    Thanks
    64

    Re: Wrong way?

    Quote Originally Posted by anders2200 View Post
    ?
    system of linear equations
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Newbie
    Joined
    Dec 2011
    Posts
    5

    Re: Wrong way?

    Thank you so much, now i understand it much better
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Senior Member
    Joined
    Nov 2011
    From
    Crna Gora
    Posts
    420
    Thanks
    64

    Re: Wrong way?

    Quote Originally Posted by anders2200 View Post
    Thank you so much, now i understand it much better
    You are welcome ...
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 0
    Last Post: August 12th 2011, 05:09 PM
  2. Replies: 2
    Last Post: March 26th 2011, 07:43 AM
  3. The price of Apples SAT
    Posted in the Algebra Forum
    Replies: 11
    Last Post: February 12th 2011, 11:12 AM
  4. Percentage with apples problem
    Posted in the Algebra Forum
    Replies: 5
    Last Post: October 2nd 2010, 03:16 PM
  5. Problem with apples driving me crazy!
    Posted in the Algebra Forum
    Replies: 3
    Last Post: November 5th 2005, 09:31 AM

Search Tags


/mathhelpforum @mathhelpforum