Table: viking_1990
Columns: week
date
opponent
result
attendance

Question: Tell me the opponent for attendance of 68,264
SQL: SELECT "opponent" FROM viking_1990 WHERE "attendance" = '68,264'

Question: Tell me the sum of week for result of l 24–21
SQL: SELECT SUM("week") FROM viking_1990 WHERE "result" = 'l 24–21'

Question: Tell me the result for attendance of 54,462
SQL: SELECT "result" FROM viking_1990 WHERE "attendance" = '54,462'

Question: Tell me the opponent for attendance of 53,899
SQL: SELECT "opponent" FROM viking_1990 WHERE "attendance" = '53,899'