CREATE TABLE table_30341 ("Team" TEXT, "Outgoing manager" TEXT, "Manner of departure" TEXT, "Date of vacancy" TEXT, "Incoming manager" TEXT, "Date of appointment" TEXT)

how many new managers replaced manager(s) who resigned?
SELECT COUNT("Incoming manager") FROM table_30341 WHERE "Manner of departure" = 'Resigned'
SELECT COUNT("Incoming manager") FROM "table_30341" WHERE "Manner of departure" = 'Resigned'