CREATE TABLE table_35600 ("Rider" TEXT, "Manufacturer" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What's the number of laps for 16 grids?
SELECT SUM("Laps") FROM table_35600 WHERE "Grid" = '16'
SELECT SUM("Laps") FROM "table_35600" WHERE "Grid" = '16'