There are three numbers A, B, and C. It is known that the sum of A and B is 168. The number C is twice the average of A and B. What is the average of A, B, and C?
有甲、乙、丙三个数，已知甲、乙两数的和是168，丙数是甲、乙两数平均数的2倍，甲、乙、丙三个数的平均数是多少．
<gadget id="calculator">168 + 168</gadget>
<output>336</output>

<gadget id="calculator">336 / 3</gadget>
<output>112</output>

<result>112</result>