There are three groups A, B, and C in a workshop. The ratio of the number of people in the two groups is 3:4. It is known that there are 45 people in group A, and 85% of the number in group C. How many people are there in group C?
某车间有甲、乙、丙三个小组，甲、乙两组人数比为3：4，已知甲组有45人，丙组人数是乙组的85%，丙组有多少人？
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">45 * (4/3)</gadget>
<output>60</output>

<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">60 * (17/20)</gadget>
<output>51</output>

<result>51</result>