Xiao Ming reads a storybook, 40 pages a day, and can finish it in 8 days. If it takes 4 days to finish it, how many pages do he read every day?
小明看一本故事书，每天看40页，8天可以看完，如果要4天看完，每天看多少页？
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<result>80</result>