Xiaoxiao has read 75% of a story book, and has not read the rest of the book.
小小看了一本故事书的75%，还剩下这本书的多少没有看．
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

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