SELECT COUNT("F/Laps") FROM table_27638 WHERE "Position" = '20th'
How many f/laps did Pedro Nunes have when he was in 20th position?
CREATE TABLE table_27638 (
    "Season" real,
    "Series" text,
    "Team" text,
    "Races" real,
    "Wins" real,
    "Poles" real,
    "F/Laps" real,
    "Podiums" real,
    "Points" text,
    "Position" text
)