There are 80 pages in a book, and 55 pages have been read. Please use the simplest fraction to express what fraction of the book is the remaining pages?
一本书共有80页，看了55页．请你用最简分数表示剩下的页数是这本书的几分之几？
<gadget id="calculator">80 - 55</gadget>
<output>25</output>

<gadget id="calculator">25 / 80</gadget>
<output>5/16 = around 0.3125</output>

<result>5/16 = around 0.3125</result>