CREATE TABLE table_name_87 (grid INT, laps VARCHAR, time_retired VARCHAR)

What is the total amount of grid when the laps amount was smaller than 68 and the time/retired was injection?
SELECT SUM(grid) FROM table_name_87 WHERE laps < 68 AND time_retired = "injection"
SELECT SUM("grid") FROM "table_name_87" WHERE "injection" = "time_retired" AND "laps" < 68