Yang Yang is reading a popular science book, and he has read 120 pages in the first week, leaving (2/5) of this book unread. How many pages does this book have?
阳阳正在读一本科普书，第一周读了120页，还剩这本书的(2/5)没有读．这本书共有多少页？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">120 / (3/5)</gadget>
<output>200</output>

<result>200</result>