Yang Yang is reading a popular science book, and he has read 180 pages in the first week, leaving (1/3) of the book unread. How many pages are there in this textbook?
阳阳正在读一本科普书，第一周读了180页，还剩下这本书的(1/3)没有读．这本科普书一共多少页？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

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

<result>270</result>