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    ambrissette's Avatar
    ambrissette Posts: 1, Reputation: 1
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    #1

    Jun 26, 2012, 10:45 AM
    System of linear equations; determinants - word problem
    A mail-order company charges $4 for shipping orders of less than $50, $6 for orders from $50- $200, and $8 for orders over $200. One day the total shipping charges were $2160 for 384 orders. Find the number of orders shipped at each rate if the number of orders under $50 is 12 more than twice the number of orders over $200.

    I need three equations. I think one should be x+y+z=384 and another should be 4x+6y+8z=2160 but the third one really has me stuck. Any help is greatly appreciated. Thank you
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    Jun 26, 2012, 11:15 AM
    Hint: the third equation comes from "the number of orders under $50 is 12 more than twice the number of orders over $200."
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