The average of the numbers A and B is 80, and the number C is 68. What is the average of these three numbers?
甲、乙两数的平均数是80，丙数是68，这三个数的平均数是多少．
<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<gadget id="calculator">160 + 68</gadget>
<output>228</output>

<gadget id="calculator">228 / 3</gadget>
<output>76</output>

<result>76</result>