CREATE TABLE table_name_29 (laps INT, grid VARCHAR, driver VARCHAR)

what is the sum of laps when grid is less than 20 and johnny herbert is driving?
SELECT SUM(laps) FROM table_name_29 WHERE grid < 20 AND driver = "johnny herbert"
SELECT SUM("laps") FROM "table_name_29" WHERE "driver" = "johnny herbert" AND "grid" < 20