There are 3 classes in the third grade of Qianjin Primary School, with an average of 40 students in each class, and each person is given 5 homework books. How many homework books are needed in total?
前进小学三年级有3个班，平均每班40人，每人发5个作业本，一共需要多少个作业本？
<gadget id="calculator">40 * 3 * 5</gadget>
<output>600</output>

<result>600</result>