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25 July, 14:32

A collection of dimes and quarters total cost $3.55. There are 25 coins in all. how many quarters are there?

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  1. 25 July, 14:55
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    D + q = 25 ... d = 25 - q

    0.10d + 0.25q = 3.55

    0.10 (25 - q) + 0.25q = 3.55

    2.50 - 0.10q + 0.25q = 3.55

    -0.10q + 0.25q = 3.55 - 2.50

    0.15q = 1.05

    q = 1.05 / 0.15

    q = 7 < = = = there are 7 quarters

    d + q = 25

    d + 7 = 25

    d = 25 - 7

    d = 18 ... and 18 dimes
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