CREATE TABLE table_5481 ("# 100" FLOAT, "Season" TEXT, "Playing For" TEXT, "Against" TEXT, "Score" TEXT)

Which # 100 has a Season of 1991, and an Against of surrey?
SELECT MAX("# 100") FROM table_5481 WHERE "Season" = '1991' AND "Against" = 'surrey'
SELECT MAX("# 100") FROM "table_5481" WHERE "Against" = 'surrey' AND "Season" = '1991'