There are 216 eggs in 3 cartons, and there are 6 boxes in each carton. How many eggs are there on average in each carton?
3箱鸡蛋一共有216个，每箱有6盒，平均每盒有多少个鸡蛋？
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">216 / 18</gadget>
<output>12</output>

<result>12</result>