Xiaofang plans to write 52 pages of brush calligraphy during the winter vacation. She writes an average of 3 pages per day in the first 8 days, and finishes writing in the remaining 7 days. How many pages per day on average?
小芳计划在寒假期间写52页毛笔字，前8天平均每天写3页，剩下的7天写完，平均每天写多少页？
<gadget id="calculator">3 * 8</gadget>
<output>24</output>

<gadget id="calculator">52 - 24</gadget>
<output>28</output>

<gadget id="calculator">28 / 7</gadget>
<output>4</output>

<result>4</result>