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26 January, 15:14

Sue's Sushi placed two orders with its fish supplier. One order was for 15 pounds of salmon and 8 pounds of tuna; the order totaled $243. The other order was for 12 pounds of salmon and 6 pounds of tuna; this order totaled $192. What is the cost for one pound of salmon and one pound of tuna?

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  1. 26 January, 15:22
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    For this problem, make a system of equations.

    15s+8t=243 | 12s+6t=192

    Then multiply the second equation by 4/3 so you can have a common monomial to add/subtract out. You now have:

    15s+8t=243 | 16s+8t=256

    After subtracting, you have:

    s=13

    Now you can substitute s into one of the equations.

    12 (13) + 6t=192

    6t+156=192

    6t=36

    t=6

    The final answer is that a pound of salmon is $13 and a pound of tuna is $6.
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