CREATE TABLE table_name_5 (no_in_series INT, written_by VARCHAR, no_in_season VARCHAR)

What is the sum of the numbers in series written by sam meikle, which have 21 numbers in the season?
SELECT SUM(no_in_series) FROM table_name_5 WHERE written_by = "sam meikle" AND no_in_season = 21
SELECT SUM("no_in_series") FROM "table_name_5" WHERE "no_in_season" = 21 AND "sam meikle" = "written_by"