The third and fourth grades of Yucai Primary School each have 5 classes. The third grade has an average of 48 students per class, and the fourth grade has an average of 45 students per class. How many students are there in the third and fourth grades?
育才小学三、四年级各有5个班．三年级平均每班48人，四年级平均每班有45人．三年级和四年级共有多少人？
<gadget id="calculator">48 * 5</gadget>
<output>240</output>

<gadget id="calculator">45 * 5</gadget>
<output>225</output>

<gadget id="calculator">240 + 225</gadget>
<output>465</output>

<result>465</result>