Xiao Ming reads a 140-page story book. On the first day, he reads (1/7) of the whole book. How many pages should he read on the second day?
小明看一本140页的故事书，第一天看了全书的(1/7)，第二天应从多少页看起．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">140 * (1/7)</gadget>
<output>20</output>

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

<result>21</result>