Among the cars with an acceleration of over 10 miles per squared hour, how many of them cost more than $20000 and less than $30000?
an acceleration of over 10 miles per squared hour refers to acceleration > 10; cost more than $20000 and less than $30000 refers to price < 30000 AND price > 20000
SELECT COUNT(*) FROM data AS T1 INNER JOIN price AS T2 ON T1.ID = T2.ID WHERE T1.acceleration > 10 AND T2.price BETWEEN 20000 AND 30000