Xiaoling reads a 300-page novel, and she read 80 pages in total in the first 4 days. Based on this calculation, how many days will it take to finish reading the remaining books?
小玲看一本300页的小说，前4天共看80页．照这样计算，剩下的书还要多少天才能看完？
<gadget id="calculator">300 - 80</gadget>
<output>220</output>

<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">220 / 20</gadget>
<output>11</output>

<result>11</result>