There are 478 students in the third and fourth grades of Hope Primary School. Among them, there are 4 classes in the third grade, with an average of 52 students in each class, and 5 classes in the fourth grade. How many students are there in each class on average?
希望小学三、四年级共有学生478人，其中三年级有4个班，平均每班52人，四年级有5个班，平均每班有多少人？
<gadget id="calculator">52 * 4</gadget>
<output>208</output>

<gadget id="calculator">478 - 208</gadget>
<output>270</output>

<gadget id="calculator">270 / 5</gadget>
<output>54</output>

<result>54</result>