There are 5 classes in the third grade of Qianjin Primary School, with an average of 50 students in each class, and each person is given 3 homework books. How many homework books are needed in total?
前进小学三年级有5个班，平均每班50人，每人发3个作业本，一共需要多少个作业本？
<gadget id="calculator">50 * 5 * 3</gadget>
<output>750</output>

<result>750</result>