The Young Pioneers collected tree species. The first group consisted of 4 people, with an average of 1.2 kg of tree species per person, and the second group of 6 people, with an average of 1.25 kg of tree species per person. How many kilograms of tree species did each person collect on average for the two groups?
少先队员采集树种，第一小组4人，平均每人采集树种1.2千克，第二小组6人，平均每人采集树种1.25千克．这两个组平均每人采集树种多少千克？
<gadget id="calculator">1.2 * 4</gadget>
<output>4.8</output>

<gadget id="calculator">1.25 * 6</gadget>
<output>7.5</output>

<gadget id="calculator">4.8 + 7.5</gadget>
<output>12.3</output>

<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">12.3 / 10</gadget>
<output>1.23</output>

<result>1.23</result>