A story book has 40 pages. After reading 8 pages, you can finish reading in the remaining 4 days. How many pages are you reading per day on average?
一本故事书有40页，看了8页后，剩下的4天看完，平均每天看多少页．
<gadget id="calculator">40 - 8</gadget>
<output>32</output>

<gadget id="calculator">32 / 4</gadget>
<output>8</output>

<result>8</result>