Guanwang Elementary School held a recitation competition for disciple rules, and the school stipulated that the first and second prizes should be selected according to the ratio of 2:3. If there are 18 students who won the second prize, how many students won the first prize?
关王小学举行弟子规诵读比赛，学校规定按2：3的比评出一二等奖．如果获得二等奖的同学有18人，获一等奖的同学有多少人？
<gadget id="calculator">18 / 3</gadget>
<output>6</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>