When Xiaolin reads a book, he has read 65% of the whole book, and he has not read the rest of the book.
小林读一本书，已经读了全书的65%，还剩这本书的多少没读．
<gadget id="calculator">65 / 100</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1 - (13/20)</gadget>
<output>7/20 = around 0.35</output>

<result>7/20 = around 0.35</result>