A story book has 100 pages in total, and 60 pages have been read, what percentage of the whole book has not been read?
一本故事书共100页，已看了60页，未看的占整本书的几分之几？
<gadget id="calculator">100 - 60</gadget>
<output>40</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>