There are only 5 possible ways. There aren't 6.
1. 3 dimes, 12 nickels and 10 pennies.
2. 7 dimes, 3 nickels and 15 pennies.
3. 1 quarter, 3 dimes, 6 nickels and 15 pennies.
4. 2 quarters, 3 dimes and 20 pennies.
5. 1 half dollar, 2 dimes, 2 nickels, and 20 pennies.
There just aren't any more!
Edwin