math

posted by david

A city park employee collected 600 cents in nickels, dimes and quarters at the bottom of a wishing well. There were 10 nickels and a combined total of 25 dimes and quarters. How many dimes and quarters were at the bottom of the well? I know the answer but need help with what the equation is to get the answer. Thank you

  1. Damon

    600 = 5 n + 10 d + 25 q

    n = 10
    d + q = 25

    600 = 50 + 10 d + 25 q
    or
    550 = 10 d + 25 q
    or
    110 = 2 d + 5 q

    so
    2 d + 5 q = 110
    2 d + 2 q = 50
    ----------------
    3 q = 60
    q = 20
    you take it from there.

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