A book has 100 pages in total. Xiao Ming reads (2/5) of the whole book on the first day and the rest (1/4) on the second day. The third day should start from the first page.
一本书共100页，小明第一天看了全书的(2/5)，第二天看了剩下的(1/4)．第三天应从第多少页看起．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/5) * (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(2/5) + (3/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">100 * (11/20)</gadget>
<output>55</output>

<gadget id="calculator">55 + 1</gadget>
<output>56</output>

<result>56</result>