A book has 100 pages in total. Xiao Ming read the total number of pages (1/5) on the first day, read the total number of pages (1/4) on the second day, read the remaining pages on the third day, and read it on the third day how many pages
一本书共100页，小明第一天看了总页数(1/5)，第二天看了总页数(1/4)，剩下的第三天看完，第三天看了多少页？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/5) - (1/4)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">100 * (11/20)</gadget>
<output>55</output>

<result>55</result>