The average of three numbers is 12, the average of two of them is 11, what is the third number
三个数的平均数是12，其中两个数的平均数是11，第三个数是多少
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">11 * 2</gadget>
<output>22</output>

<gadget id="calculator">36 - 22</gadget>
<output>14</output>

<result>14</result>