A book has 120 pages, and 30 pages have been read, what percentage of the book has the number of pages read?
一本书有120页，已看了30页，已看了的页数占这本书的几分之几？
<gadget id="calculator">30 / 120</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>