A book has 100 pages in total. Xiao Ming reads (3/5) of the whole book on the first day, and the rest (2/5) on the second day. On the third day, he should start from the page number.
一本书共100页，小明第一天读了全书的(3/5)，第二天读了余下的(2/5)，第三天应从第多少页读起．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">100 * (3/5)</gadget>
<output>60</output>

<gadget id="calculator">100 - 60</gadget>
<output>40</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">40 * (2/5)</gadget>
<output>16</output>

<gadget id="calculator">60 + 16 + 1</gadget>
<output>77</output>

<result>77</result>