Huanhuan read a 240-page story book, and read (1/3) of the whole book on the first day. How many pages are left unread?
欢欢读一本240页的故事书，第1天读了全书的(1/3)．剩下多少页没有读？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">240 * (1/3)</gadget>
<output>80</output>

<gadget id="calculator">240 - 80</gadget>
<output>160</output>

<result>160</result>