Xiao Li reads a story book, has read 25 pages, and has 15 pages left. What fraction of the pages that have been viewed are the remaining pages? What fraction of the book's pages have been read?
小力看一本故事书，已经看了25页，还剩15页．剩下的页数是已看的几分之几？已看的页数占这本书页数的几分之几？
<gadget id="calculator">25 + 15</gadget>
<output>40</output>

<gadget id="calculator">25 / 40</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>