The school originally planned to distribute 7,400 trees to group A and 8,100 trees to group B. Now these trees will be planted by groups A, B, and C. The ratio of the number of people in the three groups is 5:7: 8 allocation, how many trees should be planted in Group C?
学校原计划分给甲组种7400棵树，分给乙组种8100棵树的任务，现这些树要由甲、乙、丙三个组去种，按三个组的人数比5：7：8分配，则丙组应种多少棵？
<gadget id="calculator">7_400 + 8_100</gadget>
<output>15_500</output>

<gadget id="calculator">5 + 7 + 8</gadget>
<output>20</output>

<gadget id="calculator">8 / 20</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">15_500 * (2/5)</gadget>
<output>6_200</output>

<result>6_200</result>