Xiaowen reads an extracurricular reading, and has already read (1/4) of it. What percentage of the book is the unread accounted for more than the read?
小文读一本课外阅读，已经读了它的(1/4)，未读的比已读的多占这本书的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>