The auditorium of Nanhu Central Theater is divided into upper and lower floors. There are 540 seats downstairs and 9 rows upstairs with 25 seats in each row. How many seats are there in this theater?
南湖中心剧场的观众席分上、下两层．楼下有540个座位，楼上有9排，每排有25个的座位．这个剧场共有多少个座位？
<gadget id="calculator">25 * 9</gadget>
<output>225</output>

<gadget id="calculator">225 + 540</gadget>
<output>765</output>

<result>765</result>