Question 1012769
Call the number of nickels and dimes, n and d.  Then we can write
5n + 10d = 445 (we will work in cents)
Also, we have
d = 2n - 3
Now substitute that into the first equation and get
5n + 10(2n - 3) = 445
5n + 20n - 30 = 445
25n = 475
n = 19 nickels
d = 2(19) - 3 = 35 dimes