A story book has 120 pages, read the whole book (1/6) on the first day, read the rest (1/5) on the second day, and start reading from the page number on the third day.
一本故事书有120页，第一天读了全书的(1/6)，第二天读了余下的(1/5)，第三天应从第多少页读起．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">120 - 20</gadget>
<output>100</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 * (1/5)</gadget>
<output>20</output>

<gadget id="calculator">20 + 20 + 1</gadget>
<output>41</output>

<result>41</result>