A book has 145 pages in total. Wang Xiaoyan has already read 45 pages, and she needs to finish reading the rest within 5 days. How many pages do she need to read on average per day?
一本书共有145页，王小艳已经看了45页，剩下的要在5天内看完，剩下的平均每天要看多少页？
<gadget id="calculator">145 - 45</gadget>
<output>100</output>

<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<result>20</result>