SOLUTION: The class treasury contained $30 in nickels and dimes. If there were 500 coins, how many coins of each.

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Question 259649: The class treasury contained $30 in nickels and dimes. If there were 500 coins, how many coins of each.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.N%2BD=500
2.5N%2B10D=3000
From eq. 1,
N=500-D
Substitute into eq. 2 and solve for D.
2.5N%2B10D=3000
5%28500-D%29%2B10D=3000
2500-5D%2B10D=3000
5D=500
D=100
Now use eq. 1,
N=500-D
N=500-100
N=400
There are 400 nickels and 100 dimes.