Jingjing reads a book and has already read 80 pages, leaving 120 pages unread. What percentage of the remaining pages are the pages already viewed? How much of this book is left unread?
晶晶看一本书，已经看了80页，还剩下120页没有看．已经看的页数占剩余页数的几分之几？还剩下这本书的几分之几没有看？
<gadget id="calculator">80 + 120</gadget>
<output>200</output>

<gadget id="calculator">120 / 200</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>