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Thread: can't figure out how to do mixture weighted averages

  1. #1
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    can't figure out how to do mixture weighted averages

    Hi thanks for any help in advance. I can't figure out how to do this problem.
    A grocer mixed nuts worth $2.40 a pound with nuts $1.50 a pound. How many pounds of each did he use if there was a mixture of 30 pounds averaging $2.25 a pound?
    Last edited by chipandtoast; Oct 21st 2010 at 03:08 PM. Reason: typo
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    Quote Originally Posted by chipandtoast View Post
    Hi thanks for any help in advance. I can't figure out how to do this problem.
    A grocer mixed nuts worth $2.40 a pound with nuts $1.50 a pound. How many pounds of each did he use if there was a mixture of 30 pounds averaging $2.25 a pound?
    let x = pounds of the $2.40 nuts

    y = pounds of the $1.50 nuts

    x + y = 30

    2.40x + 1.50y = 30(2.25)

    solve the system
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    Quote Originally Posted by skeeter View Post
    let x = pounds of the $2.40 nuts

    y = pounds of the $1.50 nuts

    x + y = 30

    2.40x + 1.50y = 30(2.25)

    solve the system
    So then what do I do? I had a doctors appointment so I couldn't go to algebra today and this is really confusing to me.
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  4. #4
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    Quote Originally Posted by chipandtoast View Post
    So then what do I do? I had a doctors appointment so I couldn't go to algebra today and this is really confusing to me.
    go to the links and learn how ...

    YouTube - Solving Linear Systems of Equations Using Substitution

    SYSTEMS OF EQUATIONS in TWO VARIABLES
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