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Thread: How do i use inequalities to solve this? i keep getting negative answers

  1. #1
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    How do i use inequalities to solve this? i keep getting negative answers

    Sam has to save at least 925 dollars in 8 weeks. He earns 9 dollars/h at the pizza palace and 12 dollars/h at a car wash. By law, he cannot work more than 25 hours per week. Determine the number of hours he needs to work at each job to meet his target.
    Last edited by topsquark; Sep 14th 2018 at 09:24 AM. Reason: Removed dollar signs
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  2. #2
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    Re: How do i use inequalities to solve this? i keep getting negative answers

    You need to write some constraints(inequalities). Lets define x as the number of hours he works at pizza palace and y as the number of hours he works at the car wash.
    Try writing an inequality for the total number of hours he can work in the 8 weeks and another inequality for how much money he wants to earn(at least $925).
    Let me know if you still need help
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  3. #3
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    Re: How do i use inequalities to solve this? i keep getting negative answers

    Quote Originally Posted by Rafiu View Post
    Sam has to save at least 925 dollars in 8 weeks.
    He earns 9 dollars/h at the pizza palace and 12 dollars/h at a car wash.
    By law, he cannot work more than 25 hours per week.
    Determine the number of hours he needs to work at each job to meet his target.
    Hmmm...seems to be something wrong with your problem...
    Say he works 25 hours per week at lowest rate (pizza palace):
    25 * 9 = 225; 8 weeks = 225*8 = 1800 ... quite a bit more than 925 !

    Did I miss something?
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