Xiaohong borrowed a 400-page science fiction book from the library, started reading it on April 28, and planned to finish it on May 7. How many pages does Xiao Ming read on average every day?
小红从图书馆借了一本400页的科幻书，从4月28日开始看，准备5月7日看完．小明平均每天要看多少页？
<gadget id="calculator">400 / 10</gadget>
<output>40</output>

<result>40</result>