Class 6 (1) of Xiangyang Primary School was divided into 3 groups to make paper flowers. The ratio of the work efficiency of the first, second and third groups was 5:3:4. The first group made 15 paper flowers, how many paper flowers did the third group make?
向阳小学六年(一)班分3组做纸花，第一、二、三组的工作效率的比是5：3：4．第一组做纸花15朵，第三组做纸花多少朵？
<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>