Question 570074
 A jar of coins has quarters, nickels, and dimes. The total number of coins is 100. The total value of coins is $10.50. How many coins of each are in the jar?
This is what I have so far:
q + n + d = 100
.25q + .05n + .1d = 10.50
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You need a 3rd equation statement to solve for the variables.