Xiaohong reads an 80-page story book. On the first day, she reads from the first page, and reads (1/5) of the whole book. On the second day, she should read from the first page.
小红看一本80页的故事书，第一天从第一页看起，看了全书的(1/5)，第二天应从第多少页看起．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">80 * (1/5)</gadget>
<output>16</output>

<gadget id="calculator">16 + 1</gadget>
<output>17</output>

<result>17</result>