The 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、乙平均数的(6/7)，甲、乙两数的和是924，求甲、乙、丙三数的平均数是多少？
<gadget id="calculator">924 / 2</gadget>
<output>462</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">462 * (6/7)</gadget>
<output>396</output>

<gadget id="calculator">924 + 396</gadget>
<output>1_320</output>

<gadget id="calculator">1_320 / 3</gadget>
<output>440</output>

<result>440</result>