Table: yugoslav_football_results
Columns: date
city
opponent
results
type_of_game

Question: Who was the opponent in Belgrade and had a result of 5:2?
SQL: SELECT "opponent" FROM yugoslav_football_results WHERE "city" = 'belgrade' AND "results" = '5:2'

Question: On what date was there a friendly game against Wales?
SQL: SELECT "date" FROM yugoslav_football_results WHERE "type_of_game" = 'friendly' AND "opponent" = 'wales'

Question: What were the results against the game against Egypt?
SQL: SELECT "results" FROM yugoslav_football_results WHERE "opponent" = 'egypt'

Question: What were the results against the game against Skoplje?
SQL: SELECT "results" FROM yugoslav_football_results WHERE "city" = 'skoplje'

Question: What type of game was held against France with the results of 3:1?
SQL: SELECT "type_of_game" FROM yugoslav_football_results WHERE "results" = '3:1' AND "opponent" = 'france'