The number C is the average of the two numbers A and B (5/6). The sum of the two numbers A and B is 108. What is the number C?
丙数是甲、乙两数平均数的(5/6)，甲、乙两数的和是108，丙数是多少．
<gadget id="calculator">108 / 2</gadget>
<output>54</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">54 * (5/6)</gadget>
<output>45</output>

<result>45</result>