A, B, and C work together to process a batch of parts. It is known that A and B process 112 on average, B and C process 120 on average, and A and C process 104 on average. Find the average number of parts A, B, and C process.
甲、乙、丙三个人共同加工一批零件，已知甲和乙平均加工112个，乙和丙平均加工120个，甲和丙平均加工104个，求甲、乙、丙平均加工多少个．
<gadget id="calculator">112 * 2</gadget>
<output>224</output>

<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<gadget id="calculator">104 * 2</gadget>
<output>208</output>

<gadget id="calculator">224 + 240 + 208</gadget>
<output>672</output>

<gadget id="calculator">672 / 2 / 3</gadget>
<output>112</output>

<result>112</result>