SOLUTION: jim and sue have 72 coins that are nickels and dimes. The value of the coins is 5.80. How many of each do they have?

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Question 258526: jim and sue have 72 coins that are nickels and dimes. The value of the coins is 5.80. How many of each do they have?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
N+D=72 OR N=72-D
.05(72-D)+.10D=5.80
3.6-.05D+.10D=5.80
.05D=5.80-3.60
.05D=2.20
D=2.20/.05
D=44 NUMBER OF DIMES.
N=72-44
N=28 NUMBER OF NICKELS.
PROOF:
.05*28+.10*44=5.80
1.40+4.40=5.80
5.80=5.80