A book has 200 pages. If you read the whole book (1/10) on the first day, what page should you start reading on the second day?
一本书有200页，第一天看了全书的(1/10)，第二天应该从第多少页开始看．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">200 * (1/10)</gadget>
<output>20</output>

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

<result>21</result>