The young pioneers pulled radishes in the vegetable field. The first group of 12 people pulled 870 kilograms of radishes in total; the second group of 17 people pulled a total of 1377 kilograms of radishes. Compared with the first group, how many kilograms more radishes were pulled by each person on average?
少先队员到菜地里拔萝卜，第一组12人，一共拔萝卜870千克；第二组17人，一共拔萝卜1377千克，第二组比第一组平均每人多拔萝卜多少千克？
<gadget id="calculator">1_377 / 17</gadget>
<output>81</output>

<gadget id="calculator">870 / 12</gadget>
<output>145/2 = around 72.5</output>

<gadget id="calculator">81 - (145/2)</gadget>
<output>17/2 = around 8.5</output>

<result>17/2 = around 8.5</result>