In the activity of "giving love", a total of 950 books were donated, 450 were given to children in the west, and the rest were distributed to students in 20 classes of the deaf-mute school on average. How many books can each class get?
在"献爱心"活动中，共收到捐赠的图书950本，送给西部小朋友450本，剩下的平均分给聋哑学校20个班级的学生，每个班能分到图书多少本？
<result>250</result>