A story book has 100 pages. Xiao Li reads (1/5) of this book on the first day, and how many pages should he start reading on the second day.
一本故事书有100页，小李第一天看了这本书的(1/5)，第二天应从第多少页开始看起．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 * (1/5)</gadget>
<output>20</output>

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

<result>21</result>