Answer: 23n (nickels)
16p + 11d + 20q = 47x
x = number of coins that aren't nickels
y = number of coins in all
n = nickels
so there are 74 coins in all
70y - 47x = 23n
there are 23 nickels
lets check: 23n + 16p + 11d + 20q = 70y
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