Xiao Ming reads a 250-page story book, and he has already read (3/5), and the rest has been read for 4 days. How many pages do he read every day?
小明看一本250页的故事书，已经看了(3/5)，剩下的看了4天，每天看多少页？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 4</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">250 * (1/10)</gadget>
<output>25</output>

<result>25</result>