Answer based on context:

Coming off their win over the Bears the Seahawks played on home ground for an NFC West rivalry match against the Cardinals. In the first quarter the Seahawks took the lead as kicker Olindo Mare got a 20-yard field goal. Followed in the second quarter by QB Matt Hasselbeck making a 2-yard TD pass to WR Mike Williams. The Seahawks increased their lead in the 3rd quarter with Mare nailing a 31 and a 51-yard field goal. The Cardinals replied with RB Beanie Wells getting a 2-yard TD run. The Seahawks continued to score with Mare hitting a 24-yard field goal, but the Cardinals responded in the fourth quarter with kicker Jay Feely getting a 24-yard field goal. The Seahawks pulled away with Mare making a 26-yard field goal.

What were the distances, in yards, of Olindo Mare's made field goals?
20