Add a number among 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 so that the average number of this group of numbers is 6, what is the added number?
在1，2，3，4，5，6，7，8，9，10中增加一个数，使得这组数的平均数为6，则增加的数是多少．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">6 * 11</gadget>
<output>66</output>

<gadget id="calculator">1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10</gadget>
<output>55</output>

<gadget id="calculator">66 - 55</gadget>
<output>11</output>

<result>11</result>