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7 September, 11:38

Omar stopped at a donut shop every day on his way to work. Last week he had eight donuts and five cappuccinos which gave him a total of 3000 calories. This week he had six donuts and three cappuccinos which was a total of 2160 cal. How many calories are in one doughnut? How many calories are in one cappuccino?

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  1. 7 September, 14:21
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    Donuts=d. Cappuccino = c

    8d+6c=3000

    6d+3c=2160

    Multiply second equation by 2

    12d+6c=4320

    Subtract

    8d+6c=3000

    12d+6c=4320

    -4d=-1320

    d=330

    Plug back into original equation

    6d+3c=2160

    6 (330) + 3c=2160

    1980+3c=2160

    c=60

    Donuts 330 calories

    Cappuccino 60 calories
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