There are three numbers A, B, and C. The average of A and B is 30, the average of B and C is 36, and the average of A and C is 33. What is the average of these three numbers?
甲、乙、丙三个数，甲、乙的平均数是30，乙、丙的平均数是36，甲、丙的平均数是33，这三个数的平均数是多少？
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<gadget id="calculator">33 * 2</gadget>
<output>66</output>

<gadget id="calculator">60 + 72 + 66</gadget>
<output>198</output>

<gadget id="calculator">198 / 2 / 3</gadget>
<output>33</output>

<result>33</result>