When Xiaoping read a book, he first read 60 pages, then the rest (3/5), and left 40 pages unfinished. What percentage of the pages in the book are the remaining pages?
小平读一本书，先读了60页，又读了余下的(3/5)，还剩下40页没有读完．剩下的页数占全书页数的百分之几？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">40 / (2/5)</gadget>
<output>100</output>

<gadget id="calculator">100 + 60</gadget>
<output>160</output>

<gadget id="calculator">40 / 160</gadget>
<output>1/4 = around 0.25</output>

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