Xiao Ming reads a 400-page story book, and reads (1/20) of this book on the first day, which page should he start reading on the second day?
小明看一本400页故事书，第一天看了这本书的(1/20)，第二天应该从第几页开始看起？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">400 * (1/20)</gadget>
<output>20</output>

<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<result>21</result>