4 people are weighed, and every 3 people are weighed together, and the weights obtained are 126, 129, 130, and 131 (unit: kilogram). What is the average weight of these 4 students in kilograms?
4个人称体重，每3个在一起称一次，称得的重量分别是126、129、130、131(单位：千克)．这4位同学的平均体重是多少千克．
<gadget id="calculator">126 + 129 + 130 + 131</gadget>
<output>516</output>

<gadget id="calculator">516 / 3 / 4</gadget>
<output>43</output>

<result>43</result>