SOLUTION: I have 40 dimes and nickels that equal $2.90. How many nickels do I have?

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Question 350299: I have 40 dimes and nickels that equal $2.90. How many nickels do I have?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
Let n=number of nickels and d=number of dimes.
n+d=40
5n+10d=290
.
n=40-d
.05(40-d)+.10d=2.90
2-.05d+.10d=2.90
2+.05d=2.90
.05d=.90
d=18
n=22
.
Ed