There are three numbers A, B, and C. The sum of A, B, and B is 110, the sum of B, C, and B is 120, and the sum of A, C, and C is 130. What is the average of these three numbers?
甲乙丙三个数，甲乙两数的和是110，乙丙两数的和是120，甲丙两数的和是130，则这三个数的平均值是多少．
<gadget id="calculator">110 + 120 + 130</gadget>
<output>360</output>

<gadget id="calculator">360 / 2 / 3</gadget>
<output>60</output>

<result>60</result>