If a typist types a manuscript, if he types 24 pages a day, he can finish typing in 15 days. If he needs to finish typing in 12 days, how many pages should he type every day?
一位打字员打一本书稿，如果每天打24页，15天可以打完，若要12天打完，每天应打多少页？
<result>20</result>