For a 200-page story book, Xiao Ming reads (1/4) of it on the first day, and 20% of it on the second day. How many pages should he read on the third day?
一本200页的故事书，小明第一天看了它的(1/4)，第二天看了它的20%，第三天应从第多少页看起．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">200 * (9/20)</gadget>
<output>90</output>

<gadget id="calculator">90 + 1</gadget>
<output>91</output>

<result>91</result>