Before the study, the squad leader was going to give each soldier a few bullets, but 12 were missing. At this time, 3 more soldiers came and wanted to give them the same number of bullets. It turned out that there were 30 bullets missing in total. How many bullets should be fired?
学习之前班长准备给每个战士发几颗子弹，结果缺12颗，这时又来了3个战士，也想发给他们每人同样多的子弹，结果发现一共缺少30颗子弹，每个战士应该发几颗子弹？
<gadget id="calculator">30 - 12</gadget>
<output>18</output>

<gadget id="calculator">18 / 3</gadget>
<output>6</output>

<result>6</result>