CREATE TABLE table_28725 ("No." FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "U.S. air date" CLOB, "Production code" CLOB, "U.S. viewers  ( million ) " CLOB)

How many million U.S. viewers watched the episode with the production code 3x6004?
SELECT "U.S. viewers (million)" FROM table_28725 WHERE "Production code" = '3X6004'
SELECT "U.S. viewers (million)" FROM "table_28725" WHERE "Production code" = '3X6004'