The weights of four students are 37kg, 38kg, 42kg, and 43kg respectively. What is their average weight in kg?
四个同学的体重分别是37kg、38kg、42kg、43kg，他们的平均体重是多少kg．
<gadget id="calculator">37 + 38 + 42 + 43</gadget>
<output>160</output>

<gadget id="calculator">160 / 4</gadget>
<output>40</output>

<result>40</result>