A theater has 25 rows of seats, the last row has 2 more seats than the previous row, and the last row has 70 seats. How many seats are there in this theater?
某剧院有25排座位，后一排比前一排多两个座位，最后一排有70个座位．这个剧院一共有多少个座位？
<gadget id="calculator">25 - 1</gadget>
<output>24</output>

<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<gadget id="calculator">70 - 48</gadget>
<output>22</output>

<gadget id="calculator">22 + 70</gadget>
<output>92</output>

<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">92 * (25/2)</gadget>
<output>1_150</output>

<result>1_150</result>