Obviously read a 320-page book, read (1/4) of the book on the first day, how many pages should you start reading on the second day.
明明读一本320页的书，第一天读了这本书的(1/4)，第二天应从第多少页开始读．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">320 * (1/4)</gadget>
<output>80</output>

<gadget id="calculator">80 + 1</gadget>
<output>81</output>

<result>81</result>