CREATE TABLE table_51168 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Attendance" CLOB)

How many weeks had a Result of w 20 6?
SELECT SUM("Week") FROM table_51168 WHERE "Result" = 'w 20–6'
SELECT SUM("Week") FROM "table_51168" WHERE "Result" = 'w 20–6'