The average of the two numbers A and B is 24, the average of the two numbers B and C is 28, the average of the two numbers A and C is 35, what is the average of the three numbers A, B, and C?
甲、乙两数的平均数是24，乙、丙两数的平均数是28，甲、丙两数的平均数是35，甲、乙、丙三数的平均数是多少？
<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<gadget id="calculator">28 * 2</gadget>
<output>56</output>

<gadget id="calculator">35 * 2</gadget>
<output>70</output>

<gadget id="calculator">48 + 56 + 70</gadget>
<output>174</output>

<gadget id="calculator">174 / 2 / 3</gadget>
<output>29</output>

<result>29</result>