Results 1 to 3 of 3

Math Help - percentage question

  1. #1
    Newbie
    Joined
    Jan 2009
    Posts
    7

    percentage question

    Revewing for college math placement test that expired after a year and need to retake it. so working on practice tests till i can fully be comfortable. I am horrible at math, and always have to keep relearning. It's always been my hardest subject.

    "Mary has taken three tests with grades of 58%, 62%, and 64%. What does she need to score on test 4 to average exactly 68% on all four tests?"


    I've tried putting the percentages in my calculator as decimals and adding them ".58+.62+.64=1.84"

    I've tried putting the percentages in my calculator as decimals and dividing them ".58/.62/.64=1.461693548"

    " " multiplying them ".58*.62*.64=.230144"

    I know subtracting them would lead to nothing.


    I've tried putting the percentages as decimals, adding them and diving by 4} ".58+.62+.64/4=1.36"

    I've done "((58/100)(62/100)(64/100))/4=.46"

    I can't seem to remember how to work the problem and get the right answer.

    ***Thank you so much for taking the time to read my post and returning any advice on my problem at hand! =D
    Last edited by Sky MacKenna; January 12th 2009 at 01:17 PM. Reason: had to say thank you
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Mar 2007
    Posts
    1,240

    Talking

    Quote Originally Posted by Sky MacKenna View Post
    "Mary has taken three tests with grades of 58%, 62%, and 64%. What does she need to score on test 4 to average exactly 68% on all four tests?"
    Let each test be worth a hundred points. How many points does she have so far?

    How many points are possible (assuming perfect scores on everything) on the four tests together?

    If she wants 68% overall, how many of those points must she earn?

    Given her current point total and her desired point total, how many more points does she need?

    Then what percentage does she need on the last test?

    Have fun!
    Last edited by mr fantastic; January 12th 2009 at 03:45 PM. Reason: No edit - just flagging this post as having been moved from a duplicate thread.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by Sky MacKenna View Post
    Revewing for college math placement test that expired after a year and need to retake it. so working on practice tests till i can fully be comfortable. I am horrible at math, and always have to keep relearning. It's always been my hardest subject.

    "Mary has taken three tests with grades of 58%, 62%, and 64%. What does she need to score on test 4 to average exactly 68% on all four tests?"

    [snip]
    Solve \frac{58 + 62 + 64 + x}{4} = 68 for x (assuming all tests carry equal weight).
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Percentage Question
    Posted in the Algebra Forum
    Replies: 1
    Last Post: October 2nd 2011, 03:18 PM
  2. Percentage question
    Posted in the Business Math Forum
    Replies: 1
    Last Post: August 15th 2011, 06:30 PM
  3. Percentage Question
    Posted in the Statistics Forum
    Replies: 2
    Last Post: December 23rd 2010, 04:58 PM
  4. Percentage question #3.
    Posted in the Algebra Forum
    Replies: 3
    Last Post: October 21st 2009, 08:19 PM
  5. Can someone help me? Percentage question
    Posted in the Algebra Forum
    Replies: 2
    Last Post: June 29th 2008, 04:43 PM

Search Tags


/mathhelpforum @mathhelpforum