Table:
text: FIL World Luge Natural Track Championships
Medal table
Medal table
Rank_ Nation Gold Silver Bronze Total
1 Italy 29 28 28 85
2 Austria 19 21 21 61
3 Russia (Since 1994) 7 7 2 16
4 Poland 0 0 4 4
5 Commonwealth of Independent States (1992 only) 1 0 0 1
6 Soviet Union (1979-90) 0 0 1 1

Question: Tell me the total for Silver more than 0 for Italy with Gold less than 29 for FIL Luge World Championships on Natural Track?

Question: Tell me the average Bronze for less than 4 total and Silver more than 0 for FIL Luge World Championships on Natural Track?

Question: I want to know the total for Silver over 0, Bronze over 21 and Gold over 29 for FIL Luge World Championships on Natural Track?