book is divided into volumes 1 and 2. It is known that 25% of the pages in the volume 1 are equal to 2/5 of the pages in the volume 2, and the volume 2 has 200 pages. How many pages does the volume 1 have in this book?
一部书，分上、下两册，已知上册页数的25%与下册页数的(2/5)相等，且下册共有200页，这部书上册有多少页？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) / (1/4)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">200 * (8/5)</gadget>
<output>320</output>

<result>320</result>