Number C is the average of A and B (6/7). The sum of A and B is 924. What is the average of A, B and C?
丙数是甲、乙两数平均数的(6/7)，甲、乙两数的和是924，那么甲、乙、丙三数的平均数是多少．
<gadget id="calculator">1_320 / 3</gadget>
<output>440</output>

<result>440</result>