Results 1 to 2 of 2

Math Help - Difficult mixing ingredients

  1. #1
    Senior Member DivideBy0's Avatar
    Joined
    Mar 2007
    From
    Melbourne, Australia
    Posts
    432

    Difficult mixing ingredients

    I have 450 grams of salt and flour mix. How many grams of flour should I add to reduce the percentage of salt in the mixture to 90% of what it was?

    (a) 50
    (b) 10
    (c) 30
    (d) 45
    (e) 60
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Forum Admin topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    9,889
    Thanks
    326
    Awards
    1
    Quote Originally Posted by DivideBy0 View Post
    I have 450 grams of salt and flour mix. How many grams of flour should I add to reduce the percentage of salt in the mixture to 90% of what it was?

    (a) 50
    (b) 10
    (c) 30
    (d) 45
    (e) 60
    You want to add x grams of flour to the 450 grams of salt. Thus you will have a total mass of 450 + x grams. This will make the amount of salt be 90% of the total so:
    \frac{450}{450 + x} = \frac{90}{100} <-- Cross multiply

    (450)(100) = (90)(450 + x)

    45000 = 40500 + 90x

    45000 - 40500 = 90x

    4500 = 90x

    \frac{4500}{90} = x

    x = 50

    So we need to add 50 grams of flour.

    -Dan
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Grouping efficiency - baskets, ingredients, and pies
    Posted in the Math Puzzles Forum
    Replies: 13
    Last Post: October 7th 2011, 03:29 AM
  2. Replies: 1
    Last Post: April 12th 2011, 03:33 AM
  3. Mixing
    Posted in the Differential Geometry Forum
    Replies: 1
    Last Post: October 13th 2009, 03:16 PM
  4. Mixing problem
    Posted in the Calculus Forum
    Replies: 1
    Last Post: March 15th 2009, 02:08 PM
  5. mixing
    Posted in the Math Topics Forum
    Replies: 7
    Last Post: June 24th 2007, 05:12 PM

Search Tags


/mathhelpforum @mathhelpforum