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10 February, 10:57

And has some dimes and quarters. If she has 20 coins worth a total of $3.80, how many of each type of coin does she have?

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  1. 10 February, 11:00
    0
    12 quarters and 8 dimes. Ask me if you have any questions
  2. 10 February, 11:10
    0
    D + q = 20 ... d = 20 - q

    0.10d + 0.25q = 3.80

    0.10 (20 - q) + 0.25q = 3.80

    2 - 0.10q + 0.25q = 3.80

    -0.10q + 0.25q = 3.80 - 2

    0.15q = 1.80

    q = 1.80/0.15

    q = 12 < = = = 12 quarters

    d + q = 20

    d + 12 = 20

    d = 20 - 12

    d = 8 < = = 8 dimes
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