Write SQL query to solve given problem: Among the countries with the African ethnic group, how many of them has a population of over 10000000?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T1.Name) FROM country AS T1 INNER JOIN ethnicGroup AS T2 ON T1.Code = T2.Country WHERE T2.Name = 'African' AND T1.Area > 10000000