Table:
text: 1973 Buffalo Bills season
Schedule
Schedule
Game Date_ Opponent Result_ Bills_points Opponents Bills_first_downs Record
10 Nov. 18 Miami Dolphins Loss 0 17 15 5–5
11 Nov. 25 at Baltimore Colts Win 24 17 16 6–5
12 Dec. 2 at Atlanta Falcons Win 17 6 17 7–5
13 Dec. 9 New England Patriots Win 37 13 13 8–5

Question: How many first downs did the Buffalo Bills have when their opponent had 6 on the 1973 season schedule?