Xiaoying reads a book, read the whole book on the first day (1/10), and read the whole book on the second day (1/15). The book has 300 pages in total, how many pages should he read on the third day.
小英看一本书，第一天看了全书的(1/10)，第二天看了全书的(1/15)．全书共300页，第三天他应从第多少页看起．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">300 * (1/10)</gadget>
<output>30</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">300 * (1/15)</gadget>
<output>20</output>

<gadget id="calculator">30 + 20</gadget>
<output>50</output>

<gadget id="calculator">50 + 1</gadget>
<output>51</output>

<result>51</result>