Results 1 to 3 of 3
Like Tree1Thanks
  • 1 Post By emakarov

Math Help - simple word problem question

  1. #1
    Senior Member
    Joined
    Nov 2012
    From
    Hawaii
    Posts
    260
    Thanks
    2

    simple word problem question

    how is the answer D? you'll get 9 = -9
    isn't the answer A? cuz then you'll get -18 = -18 which is the same
    Attached Thumbnails Attached Thumbnails simple word problem question-screen-shot-2012-12-18-8.52.54-am.png  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Oct 2009
    Posts
    5,530
    Thanks
    774

    Re: simple word problem question

    Are you reading Arithmetica by Diophantus (3rd century AD)? Mathematicians started using +, - and * to write equations in the 16th century...

    The phrase "that number subtracted from 2 times 6" is ambiguous. It may mean "(that number subtracted from 2) times 6" or "that number subtracted from (2 times 6)." In fact, the latter possibility is less likely because problem statements usually don't contain parts that can be easily simplified. (E.g., I would be surprised to see a problem saying, "A car goes from A to be at (30 + 40) miles per hour" instead of "at 70 miles per hour.")

    Suppose the problem says "Three times a number is the same as (that number subtracted from 2) times 6." Denote the number by x. Then x subtracted from 2 is 2 - x. Therefore, the equation is 3x = 6(2 - x). However, its solution is not in the list.

    Suppose the problem says "Three times a number is the same as that number subtracted from (2 times 6)." Then the equation is 3x = 2 * 6 - x, which gives the answer (D).

    You apparently thought that "that number subtracted from 2 times 6" means x - 12. Then the equation is 3x = x - 12, i.e., x = -6. But this interpretation is incorrect.
    Thanks from asilvester635
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Jul 2012
    From
    INDIA
    Posts
    828
    Thanks
    209

    Re: simple word problem question

    I think it would be like this:
    Three times a number equal to the number subtracted from 2 time 6 i.e., 12
    let the number be 'x'
    Thus we have 3x = 12 - x
    or 4x = 12
    that gives x = 3
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Simple Single Unknown Word Problem
    Posted in the Algebra Forum
    Replies: 5
    Last Post: November 8th 2010, 12:00 PM
  2. Trouble with simple word problem
    Posted in the Algebra Forum
    Replies: 3
    Last Post: October 13th 2010, 02:47 PM
  3. Simple word problem
    Posted in the Algebra Forum
    Replies: 1
    Last Post: April 30th 2010, 09:10 AM
  4. Word problem that looks so simple!
    Posted in the Algebra Forum
    Replies: 4
    Last Post: May 22nd 2008, 01:57 AM
  5. [SOLVED] simple word problem help
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: October 23rd 2006, 01:49 PM

Search Tags


/mathhelpforum @mathhelpforum