What were the total number of matches played when the Deccan Chargers had a strike rate of 15.5?
CREATE TABLE "most_wickets" (
  "player" text,
  "team" text,
  "matches" real,
  "overs" real,
  "wickets" real,
  "economy_rate" real,
  "average" real,
  "strike_rate" real,
  "best_bowling" text
);
SELECT MAX("matches") FROM "most_wickets" WHERE "team"='deccan chargers' AND "strike_rate">15.5;