There are 45 students in Class 1 of Grade 4, and there are 630 homework books in two semesters. How many homework books do each student use per semester on average?
四年级一班有45名学生，两个学期共用630本作业本，平均每个学生每学期用多少本作业本？
<gadget id="calculator">630 / 2 / 45</gadget>
<output>7</output>

<result>7</result>