Smile and read a 150-page book, read it in the first week (1/5), how many pages should you read in the second week.
笑笑看一本150页的书，第一周看了(1/5)，第二周应从第多少页看起．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 * (1/5)</gadget>
<output>30</output>

<gadget id="calculator">30 + 1</gadget>
<output>31</output>

<result>31</result>