Question 962207
n = number of nickels
d = number of dimes
q = number of quarters


5n + 10d + 25q = 875
d = 2n
d = q + 10


(substitute second equation)
25n + 25q = 875
2n - q = 10


2n + 2q = 70
-2n + q = -10
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3q = 60
q = 20 ---> d = 30 ---> n = 15


There are 15 nickels, 30 dimes, and 20 quarters.