A, B, and C are three numbers, the average of A and B is 84, the average of B and C is 92, and the number of B is 85. Find the average of the three numbers A, B, and C.
甲、乙、丙三个数，甲与乙的平均数是84，乙与丙的平均数是92，乙数是85．求甲、乙、丙三个数的平均数．
<gadget id="calculator">84 * 2</gadget>
<output>168</output>

<gadget id="calculator">92 * 2</gadget>
<output>184</output>

<gadget id="calculator">184 - 85</gadget>
<output>99</output>

<gadget id="calculator">168 + 99</gadget>
<output>267</output>

<gadget id="calculator">267 / 3</gadget>
<output>89</output>

<result>89</result>