CREATE TABLE table_25680 ("Stage" FLOAT, "Winner" TEXT, "General classification" TEXT, "Mountains classification" TEXT, "Points classification" TEXT, "Youth classification" TEXT, "Team Classification" TEXT)

How many Mountains Classifications were in the race with Mike Northey as Youth Classification?
SELECT COUNT("Mountains classification") FROM table_25680 WHERE "Youth classification" = 'Mike Northey'
SELECT COUNT("Mountains classification") FROM "table_25680" WHERE "Youth classification" = 'Mike Northey'