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22 October, 04:26

Yoko's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Yoko $4.25 per pound, and type B coffee costs $5.90 per pound. This month, Yoko made 133 pounds of the blend, for a total cost of $584.20. How many pounds of type B coffee did she use?

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  1. 22 October, 04:44
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    Type A = 121.45

    Type B = 11.55

    Step-by-step explanation:

    First we developed 2 equations with the information they gave us

    4.25 * X + 5.90 * Y = 584.20

    X + Y = 133

    Now we clear one of the unknowns with respect to the other and replace it in the other equation.

    X = 133 - Y

    4.25 (133 - Y) + 5.90 * Y = 584.20

    here we have enough information to solve and remove the unknowns

    565.25 - 4.25Y + 5.90Y = 584.20

    - 4.25Y + 5.90Y = 584.20 - 565.25

    1.64Y = 18.95

    Y = 18.95/1.64

    Y = 11.55

    X = 133 - 11.55

    X = 121.45
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