Xiao Ming reads a 120-page story book and has already read (5/6) of the whole book. How many pages are left?
小明看一本120页的故事书，已经看了全书的(5/6)，还剩多少页没看？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">120 * (1/6)</gadget>
<output>20</output>

<result>20</result>