Results 1 to 6 of 6

Math Help - Simple Problem

  1. #1
    Junior Member
    Joined
    Nov 2007
    Posts
    26

    Simple Problem

    Q. Clock brass consists of 64.25% copper, 34% zinc and 1.75% lead. A manufacturer has an unlimited supply of copper and lead but has only 50kg of zinc. How much closs brass can he make?

    Simple problem but I just can't get the answer.

    Please show your working out and don't just give the answer.
    Thanks.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Oct 2007
    Posts
    209
    I think you are missing a piece of information. What is the mass of each clock brass.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Sep 2008
    Posts
    31
    You will want to set up a proportion.

    So \frac {34}{100} = \frac{50}{x}

    Then you cross multiply to get \frac{54*100}{34}= x

    So x \approx158.82353 and there is your answer.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Member
    Joined
    Oct 2007
    Posts
    209
    Quote Originally Posted by JoshHJ View Post
    You will want to set up a proportion.

    So \frac {34}{100} = \frac{50}{x}

    Then you cross multiply to get \frac{54*100}{34}= x

    So x \approx158.82353 and there is your answer.
    Edit:
    My bad, I misread the problem.

    you cross multiplied wrong
    It should be
    \frac{50*100}{34}= x
    x=147
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Junior Member
    Joined
    Nov 2007
    Posts
    26
    OK I get it now. Thanks.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Junior Member
    Joined
    Sep 2008
    Posts
    31
    Quote Originally Posted by Linnus View Post
    Edit:
    My bad, I misread the problem.

    you cross multiplied wrong
    It should be
    \frac{50*100}{34}= x
    x=147
    Hah, yeah. It's getting too late, and I have no idea where the 54 came from.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: February 11th 2011, 04:28 AM
  2. plz help on a simple problem
    Posted in the Algebra Forum
    Replies: 4
    Last Post: May 7th 2010, 02:34 AM
  3. simple problem
    Posted in the Discrete Math Forum
    Replies: 0
    Last Post: April 22nd 2010, 12:45 AM
  4. Simple Log problem
    Posted in the Algebra Forum
    Replies: 2
    Last Post: April 19th 2010, 06:46 AM
  5. A simple geo problem
    Posted in the Geometry Forum
    Replies: 2
    Last Post: September 28th 2009, 07:44 PM

Search Tags


/mathhelpforum @mathhelpforum