The ratio of the three numbers A, B, and C is 1:3:5. The average of the three numbers A, B, and C is 60. What is the number C?
甲乙丙三个数的比是1：3：5，甲乙丙三个数的平均数是60，则丙数是多少
<gadget id="calculator">1 + 3 + 5</gadget>
<output>9</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">60 * (1/3) * 5</gadget>
<output>100</output>

<result>100</result>