Table: cricket_1969_players_league
Columns: player
county
balls
wickets
average
economy
bbi
4wi
5wi

Question: When the number of wickets is 29, what was the economy?
SQL: SELECT "economy" FROM cricket_1969_players_league WHERE "wickets" = 29

Question: How many wickets was there when the economy was 3.64?
SQL: SELECT "wickets" FROM cricket_1969_players_league WHERE "economy" = '3.64'

Question: What is the average of all the wickets that were 27?
SQL: SELECT "average" FROM cricket_1969_players_league WHERE "wickets" = 27