A story book has a total of 250 pages. After Xiaogang read it for 5 days, there are still 50 pages left. How many pages does Xiaogang read on average every day?
一本故事书一共是250页，小刚看了5天以后还剩下50页，小刚平均每天看多少页？
<gadget id="calculator">250 - 50</gadget>
<output>200</output>

<gadget id="calculator">200 / 5</gadget>
<output>40</output>

<result>40</result>