In a story book, Xiaolei has read 50 pages and left 30 pages unread. What fraction of the pages are the pages read?
一本故事书，小磊看过50页，还剩下30页没有看，看过的页数占这本书页数的几分之几？
<gadget id="calculator">50 + 30</gadget>
<output>80</output>

<gadget id="calculator">50 / 80</gadget>
<output>5/8 = around 0.625</output>

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