Results 1 to 5 of 5

Math Help - How to create a formula

  1. #1
    Senior Member
    Joined
    Jul 2008
    Posts
    313

    How to create a formula

    If a party cost 100 to hire a venue, and 10 per person for refreshments, five guests don't pay anything, but all other people will be asked to pay equal amounts, how do I know if the formula I create is in the right order?

    I thought;

    n = 100 + 10p

    This gives me two unknowns and I am not sure how to work it out?

    Any help much appreciated
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    May 2011
    From
    Islamabad
    Posts
    94

    Re: How to create a formula

    your formula gives the total cost of the party. If you wants to calculate amount each person had to pay you divide it by p-5
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member
    Joined
    Jul 2008
    Posts
    313

    Re: How to create a formula

    Quote Originally Posted by waqarhaider View Post
    your formula gives the total cost of the party. If you wants to calculate amount each person had to pay you divide it by p-5
    Not sure how that works, I have not discovered how to find out how many people would attend?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1

    Re: How to create a formula

    The cost per person is the cost of the party [x(n)] divided by the number of people attending (n).

    The cost of the party you (correctly) have as x(n) = 100-10n

    The amount of people who pay are the n people who attend minus the 5 who do not pay (assuming they all attend)

    y(n) = \dfrac{100+10n}{n-5} where y(n) is the cost per person.

    The value of x(n) or y(n) cannot be determined without a value of n.
    Last edited by e^(i*pi); July 28th 2011 at 01:23 PM. Reason: typo, see post below. "-" changed to "+"
    Follow Math Help Forum on Facebook and Google+

  5. #5
    MHF Contributor
    Joined
    Dec 2007
    From
    Ottawa, Canada
    Posts
    3,089
    Thanks
    67

    Re: How to create a formula

    Quote Originally Posted by e^(i*pi) View Post
    y(n) = \dfrac{100-10n}{n-5} where y(n) is the cost per person.
    Typo. (100 + 10n) / (n - 5)

    So if 8 people attend:
    (100 + 80) / 3 = 180 / 3 = 60
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Create an equation
    Posted in the Advanced Applied Math Forum
    Replies: 5
    Last Post: October 10th 2011, 07:26 PM
  2. Replies: 5
    Last Post: June 1st 2011, 06:52 PM
  3. how to create a sequence s1 s2 s3 ..s11 s12....
    Posted in the Math Software Forum
    Replies: 6
    Last Post: June 4th 2010, 11:31 PM
  4. create math formula
    Posted in the Math Topics Forum
    Replies: 5
    Last Post: March 24th 2009, 08:13 AM
  5. Create/Solve Probability Formula, Using values 1-50
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: July 30th 2008, 02:51 PM

Search Tags


/mathhelpforum @mathhelpforum