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

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

<gadget id="calculator">60 * 3 * (1/2)</gadget>
<output>90</output>

<result>90</result>