A book has 240 pages. I read (1/4) of the whole book on the first day, and read (2/3) of the first day on the second day. How many pages are left?
一本书240页，第一天看了全书的(1/4)，第二天看的是第一天的(2/3)，还剩下多少页？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">240 * (1/4)</gadget>
<output>60</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">240 * (1/4) * (2/3)</gadget>
<output>40</output>

<gadget id="calculator">240 - 60 - 40</gadget>
<output>140</output>

<result>140</result>