8 teams play a game, every two teams play one game, how many games are played in total?
8支球队进行比赛，每两支球队赛一场，共进行多少场比赛．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">8 * (7/2)</gadget>
<output>28</output>

<result>28</result>