The average of the numbers A and B is 60, and the number C is 69. What is the average of these three numbers?
甲、乙两数的平均数是60，丙数是69，这三个数的平均数是多少．
<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">120 + 69</gadget>
<output>189</output>

<gadget id="calculator">189 / 3</gadget>
<output>63</output>

<result>63</result>