Table:
text: Athletics at the 1955 Pan American Games
Medal table
Medal table
Rank_ Nation Gold Silver Bronze Total
1 United States 20 14 8 42
2 Argentina 4 3 2 9
3 Chile 2 1 6 9
4 Brazil 1 1 5 7
5 Cuba 1 1 3 5
6 Guatemala 1 0 1 2
7 Mexico 0 2 2 4
8 Venezuela 0 2 1 3
9 Jamaica 0 2 0 2
10 Trinidad and Tobago 0 1 1 2
11 Uruguay 0 1 0 1
11 Colombia 0 1 0 1
13 Puerto Rico 0 0 1 1

Question: For track and field at the 1955 Pan American Games, how many silver medals did the country that won 20 gold medals win?