A story book has 160 pages in total. I read (1/4) of the whole book on the first day and (2/5) of the whole book on the second day.
一本故事书共160页，第一天看了全书的(1/4)，第二天看了全书的(2/5)，若第三天接着看，应从第多少页看起．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/4) + (2/5)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">160 * (13/20)</gadget>
<output>104</output>

<gadget id="calculator">104 + 1</gadget>
<output>105</output>

<result>105</result>