Answer:
29 dimes
Step-by-step explanation:
Let D represent dimes and the nickels as N.
We know that there are a total of 64 coins, so D + N = 64. The total of our coins is $5.15, since each dime is worth 10 cents and each nickel is worth 5 cents, we can display it as 10D + 5N = 515. Now, we can set up a system of equations as shown
D + N = 64
10D + 5N = 515
the solutions to the equations are D=29 and N=35
Hope this helps!