The number A is 33.5, and the average of B and C is 30.5. What is the average of these three numbers?
甲数是33.5，乙数与丙数的平均数是30.5，这三个数的平均数是多少？
<gadget id="calculator">30.5 * 2</gadget>
<output>61</output>

<gadget id="calculator">61 + 33.5</gadget>
<output>94.5</output>

<gadget id="calculator">94.5 / 3</gadget>
<output>31.5</output>

<result>31.5</result>