Xiao Ming reads an 86-page "Sea World". I read 21 pages on the first day and 24 pages on the second day, how many pages are left?
小明看一本86页的《海洋世界》．第一天看了21页，第二天看了24页，还剩多少页？
<gadget id="calculator">86 - 21 - 24</gadget>
<output>41</output>

<result>41</result>