A book with 100 pages, if you read it on the first day (3/20), what page should you start reading on the second day.
一本书100页，第一天看了(3/20)，第二天应从第多少页看起．
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">100 * (3/20)</gadget>
<output>15</output>

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

<result>16</result>