The school plans to carry out shuttlecock round-robin competition around New Year's Day. If it is divided into five and six grades, then there will be 3 games for the men's and women's teams in each grade, that is, there will be 12 games in total. If there is a round-robin competition for six classes in grades five and six regardless of grade, how many games will be arranged in total for this event?
学校计划在元旦前后开展毽球循环比赛．如果分五、六两个年级进行，那么各年级男、女队都将有3场比赛，也就是共要赛12场．要是不分年级，安排五、六年级六个班的循环比赛，那这次活动一共要安排多少场比赛．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">6 * (5/2)</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>