A storybook has a total of 237 pages. Ding Ding finished reading it in 9 days. He read an average of 23 pages a day in the first three days, and how many pages in an average day did he read in the remaining 6 days?
一本故事书共237页，丁丁9天看完，前三天平均每天看23页，剩下6天，平均每天看多少页？
<gadget id="calculator">23 * 3</gadget>
<output>69</output>

<gadget id="calculator">237 - 69</gadget>
<output>168</output>

<gadget id="calculator">168 / 6</gadget>
<output>28</output>

<result>28</result>