Results 1 to 4 of 4

Math Help - Percentage question #3.

  1. #1
    Newbie
    Joined
    Aug 2009
    Posts
    15

    Post Percentage question #3.

    Question :

    Jane bought 5kg of grapes and 10kg of cherries at $82.50.
    If Jane were to buy 10kg of grapes and 5kg of cherries, she would only pay $75

    If 100grams of grapes cost 45 cents, find the cost of 1kg of cherries.
    Last edited by mr fantastic; June 7th 2010 at 04:40 AM. Reason: Re-titled.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Dec 2007
    From
    Ottawa, Canada
    Posts
    3,080
    Thanks
    66
    I don't see the equations you set up to solve this.
    Did you forget to post them?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member
    Joined
    Nov 2008
    Posts
    461
    Hi.

    Quote Originally Posted by dtay View Post
    Question :

    Jane bought 5kg of grapes and 10kg of cherries at $82.50.
    If Jane were to buy 10kg of grapes and 5kg of cherries, she would only pay $75

    If 100grams of grapes cost 45 cents, find the cost of 1kg of cherries.
    "Jane bought 5kg of grapes and 10kg of cherries at $82.50."

    5*x + 10*y = 82.50 (1), where x is the price of grapes/kg; y price of 1kg cherries.

    "If Jane were to buy 10kg of grapes and 5kg of cherries, she would only pay $75"

    10*x+5y = 75 (2)

    "If 100grams of grapes cost 45 cents, find the cost of 1kg of cherries."

    1kg grapes cost 10*0.45 = $4.5 = x. Now substitute this into (1) and (2), you get y=$6, so 1kg of cherries cost $6

    Any questions?

    Yours
    Rapha
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Oct 2009
    From
    In limbo
    Posts
    18
    Let g=#grapes
    Let c=#cherries

    Equation 1: 5g+10c=82.5
    Equation 2: 10g+5c=75
    multiply equation 1 by 2

    10g+20c=165
    - 10g+5c=75
    -----------------
    15c=90
    c=6
    1kg of cherries costs 6 dollars.

    (Rapha beat me to it lol)
    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
    Posted in the Algebra Forum
    Replies: 2
    Last Post: January 12th 2009, 03:22 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