CREATE TABLE table_3855 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT, "U.S. viewers  ( millions ) " TEXT)

How many episodes had an audience of exactly 25.3 million viewers in the U.S.A.?
SELECT COUNT("Production code") FROM table_3855 WHERE "U.S. viewers (millions)" = '25.3'
SELECT COUNT("Production code") FROM "table_3855" WHERE "U.S. viewers (millions)" = '25.3'