There are 16 men's A football teams in our country. Every two teams have to play a game. How many games need to be arranged in total?
我国有16支男子甲A足球队，每两个队要进行一场比赛，共需要安排多少场比赛．
<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<result>120</result>