There are 5 classes in the third and fourth grades in our school, with an average of 62 students in each class in the third grade and 64 students in each class in the fourth grade. How many students are there in the third and fourth grades?
我们学校三、四年级都有5个班，三年级平均每班62人，四年级平均每班64人．三、四年级共有多少人？
<gadget id="calculator">5 * 62</gadget>
<output>310</output>

<gadget id="calculator">5 * 64</gadget>
<output>320</output>

<gadget id="calculator">310 + 320</gadget>
<output>630</output>

<result>630</result>