posted by Pam .
If I have 27 coins (dimes and nickels) that total $1.95. How many are dimes and how many are nickels
D = # of Dimes, N = # of nickels
D + N = 27, therefore
D = 27 - N
.10D + .05N = 1.95
Substitute 27 - N for D in second equation and solve for N. Put that value in the first equation to find D. To check, put both in the second equation.
I hope this helps.