A 120-page book, I read (1/3) mischievously, how many pages are left unread?
一本120页的书，淘气读了(1/3)，还剩多少页没有读？
<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>

<gadget id="calculator">120 * (2/3)</gadget>
<output>80</output>

<result>80</result>