A book has 100 pages. Xiaolu read 20% of the book on the first day and 15% of the book on the second day. How many pages should I start on the third day?
一本书有100页，小路第一天看了这本书的20%，第二天看了这本书的15%．第三天应该从多少页看起．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(1/5) + (3/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">100 * (7/20)</gadget>
<output>35</output>

<gadget id="calculator">35 + 1</gadget>
<output>36</output>

<result>36</result>