How many female employees are in charge of 3 or more territories?
female employees refers to TitleOfCourtesy = 'Mrs.' or TitleOfCourtesy = 'Ms.'; in charge of 3 or more territories refers to TerritoryID > = 3;
SELECT COUNT(EID) FROM ( SELECT T1.EmployeeID AS EID FROM Employees AS T1 INNER JOIN EmployeeTerritories AS T2 ON T1.EmployeeID = T2.EmployeeID WHERE T1.TitleOfCourtesy IN ('Ms.' OR 'Mrs.') GROUP BY T1.EmployeeID HAVING COUNT(T2.TerritoryID) >= 3 ) T1