A book has 180 pages. If you read (2/5) of the whole book on the first day, how many pages should you start reading on the second day?
一本书有180页，第一天读了全书的(2/5)，第二天应从多少页开始读起．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">180 * (2/5)</gadget>
<output>72</output>

<gadget id="calculator">72 + 1</gadget>
<output>73</output>

<result>73</result>