The average of the three numbers A, B, and C is 50. The ratio of these three numbers is 2:3:5. What is the number C?
甲、乙、丙三个数的平均数是50，这三个数的比是2：3：5，丙数是多少？
<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">50 * 3 * (1/2)</gadget>
<output>75</output>

<result>75</result>