A story book has 525 pages, Xiaohua has already read 345 pages, and finished reading the remaining 12 days, how many pages should be read every day?
一本故事书525页，小华已经看了345页，剩下的12天看完，剩下的每天要看多少页？
<gadget id="calculator">525 - 345</gadget>
<output>180</output>

<gadget id="calculator">180 / 12</gadget>
<output>15</output>

<result>15</result>