There are 12 basketball teams participating in the employee sports meeting. If every two teams play a game, how many games are there in total?
职工运动会上有12支篮球队参加比赛，如果每两支球队都进行一场比赛，一共有多少场比赛？
<gadget id="calculator">11 / 2</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">12 * (11/2)</gadget>
<output>66</output>

<result>66</result>