CREATE TABLE table_48897 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" TEXT)

Which Week has a Result of l 21-19?
SELECT COUNT("Week") FROM table_48897 WHERE "Result" = 'l 21-19'
SELECT COUNT("Week") FROM "table_48897" WHERE "Result" = 'l 21-19'