Zachary saved x nickels and y dimes last month. Lily saved x nickels and 2y dimes. Lily saved $2 more than Zachary and the total number of her dimes is 4 times the total number of her nickels.

(a) How much coins does Zachary have?
(b) How much did Lily save?
(c) How much did Zachary save?

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  1. 5x + 10y + 200 = 5x + 20y
    2y = 4x
    y = 2x

    5x + 20y + 200 = 5x + 40x
    200 = 20x
    x = 10

    Zach saved 10 nickels and 20 dimes for $2.50

    Lily saved 10 nickels and 40 dimes = $4.50

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  2. 25x^3-55^-60=

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