Students in the third grade dancing group dance form a rectangle. Xiaoting stands in the 7th column from the left and the 11th column from the right; she is the 8th from the front and the 12th from the back. There are the same number of people in each row and the same number of people in each column. You Do you know how many people danced collectively?
三年级跳集体舞的同学排成一个长方形．小婷站在左起第7列，右起第11列；从前面数她是第8个，从后面数她是第12个，每行的人数一样多，每列的人数也一样多，你知道共有多少人跳集体舞吗？
<gadget id="calculator">11 - 1</gadget>
<output>10</output>

<gadget id="calculator">7 + 10</gadget>
<output>17</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">8 + 11</gadget>
<output>19</output>

<gadget id="calculator">17 * 19</gadget>
<output>323</output>

<result>323</result>