CREATE TABLE table_name_99 (week INT, result VARCHAR, attendance VARCHAR)

Tell me the week for result of l 31-27, and an Attendance smaller than 85,865
SELECT AVG(week) FROM table_name_99 WHERE result = "l 31-27" AND attendance < 85 OFFSET 865
SELECT AVG("week") FROM "table_name_99" WHERE "attendance" < 85 AND "l 31-27" = "result" OFFSET 865