There is a book, I read 20 pages on the first day, and (1/5) of this book on the second day. If I read 8 more pages, I just finished reading (2/3) of this book. This book has how many pages
有一本书，第一天看了20页，第二天看了这本书的(1/5)，如果再看8页，正好看完这本书的(2/3)，这本书有多少页？
<gadget id="calculator">20 + 8</gadget>
<output>28</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(2/3) - (1/5)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">28 / (7/15)</gadget>
<output>60</output>

<result>60</result>