The ratio of A, B, and C is 3:2:1, and the average number is 60. What is the number of C?
甲、乙、丙三个数的比是3：2：1，平均数是60，则丙数是多少
<gadget id="calculator">3 + 2 + 1</gadget>
<output>6</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">60 * (1/2) * 1</gadget>
<output>30</output>

<result>30</result>