math
posted by carol .
Joe has a collection of nickels and dimes that is worth $8.55. If the number of dimes was tripled and the number of nickels was decreased by 2, the value of the coins would be $23.45. How many nickels and dimes does he have?

math 
Mgraph
Solve the system
10D+5N=855
30D+5(N2)=2345
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