If the average age of three classmates is 12, and none of them is younger than 10, what is the possible age of the oldest of the three?
如果三名同学的平均年龄是12岁，三人中没有一个人年龄小于10岁，那么三人中年龄最大的可能是多少岁．
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">36 - 10 - 11</gadget>
<output>15</output>

<result>15</result>