A story book has 100 pages in total. Xiao Ming reads (2/5) of the whole book on the first day, the rest (3/4) on the second day, and starts from the number one on the third day.
一本故事书共有100页，小明第一天看了全书的(2/5)，第二天看了剩下的(3/4)，第三天要从第多少看起．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">100 * (2/5)</gadget>
<output>40</output>

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

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">100 * (3/5) * (3/4)</gadget>
<output>45</output>

<gadget id="calculator">40 + 45</gadget>
<output>85</output>

<gadget id="calculator">100 - 85</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<result>16</result>