CREATE TABLE table_53146 ("Rider" TEXT, "Manufacturer" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is the average lap time for retired time of +23.707 and a Grid greater than 21?
SELECT AVG("Laps") FROM table_53146 WHERE "Time/Retired" = '+23.707' AND "Grid" > '21'
SELECT AVG("Laps") FROM "table_53146" WHERE "Grid" > '21' AND "Time/Retired" = '+23.707'