The popular cinema has 400 seats downstairs, and 9 rows upstairs, with 34 seats in each row. How many more seats are downstairs than upstairs?
大众电影院楼下有400个座位，楼上有9排，每排有34个座位，楼下比楼上多多少个座位？
<gadget id="calculator">9 * 34</gadget>
<output>306</output>

<gadget id="calculator">400 - 306</gadget>
<output>94</output>

<result>94</result>