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4 September, 19:57

A local Dominos sold a total of 1600 small pizzas ($9) and pasta dinners ($13) during the Super Bowl. How many of each did Dominos sell if the total sales were $15,600?

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  1. 4 September, 21:49
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    S=small pizzas

    p=pasta dinners

    s+p=1600

    9s+13p=15600

    multiply first equaiton by - 9 and add to the second one

    -9s-9p=-14400

    9s+13p=15600 +

    0s+4p=1200

    4p=1200

    divide by 4

    p=300

    sub back

    s+p=1600

    s+300=1600

    minus 300 both sides

    s=1300

    1300 small pizzas

    300 pasta dinners
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