SOLUTION: A change purse contains 120 coins worth $10.They are all nickels and dimes.How many of each coins are there?

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Question 803544: A change purse contains 120 coins worth $10.They are all nickels and dimes.How many of each coins are there?
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
1) n+d=120 <--number of coins
2) 5n+10d=10(100) <-- amt of money

combining...
5n+5d=600



10d-5d=400
5d=400
d=80
80 dimes and 40 nickels