CREATE TABLE table_24141 ("Rank" FLOAT, "Commodity" TEXT, "Value  ( Int $1000 ) " FLOAT, "Production  ( MT ) " FLOAT, "Quantity world rank" TEXT, "Value world rank" TEXT)

where value world rank is 12, what is the quantity world rank?
SELECT "Quantity world rank" FROM table_24141 WHERE "Value world rank" = '12'
SELECT "Quantity world rank" FROM "table_24141" WHERE "Value world rank" = '12'