A book, after reading for a few days, there are 160 pages left, and the number of remaining pages is 20 pages less than (2/3) of this book. How many pages is this book?
一本书，看了几天后还剩160页没看，剩下的页数比这本书的(2/3)少20页，这本书多少页？
<gadget id="calculator">160 + 20</gadget>
<output>180</output>

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

<gadget id="calculator">180 / (2/3)</gadget>
<output>270</output>

<result>270</result>