An extra-curricular book has 120 pages. Congcong has already read (1/3) of this book. How many pages are left?
一本课外书120页，聪聪已经读了这本书的(1/3)，还剩下多少页没有读？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">120 * (1/3)</gadget>
<output>40</output>

<gadget id="calculator">120 - 40</gadget>
<output>80</output>

<result>80</result>