CREATE TABLE table_30600 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( million ) " TEXT)

What was the latest episode number that Meredith Averill wrote?
SELECT MAX("No. in series") FROM table_30600 WHERE "Written by" = 'Meredith Averill'
SELECT MAX("No. in series") FROM "table_30600" WHERE "Written by" = 'Meredith Averill'