Each student needs to use 8 exercise books. There are 40 students in Class 1 and 35 students in Class 2. How many exercise books are needed for these two classes?
每个同学要用8个练习本，四1班有40名学生，四2班有35名学生．这两个班共需多少个练习本？
<gadget id="calculator">35 + 40</gadget>
<output>75</output>

<gadget id="calculator">75 * 8</gadget>
<output>600</output>

<result>600</result>