A book has 120 pages, Xiaohong has read (1/3) of it, and the rest of the book has not been read.
一本书120页，小红读了它的(1/3)，还剩这本书的多少没读．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>