One book, Xiao Ming has read (3/5) of it, but he has not read much of this book.
一本书，小明看了它的(3/5)，还剩这本书的多少没看．
<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>

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