The heights of the 4 students in the third grade are 135cm, 128cm, 117cm, and 120cm. What is the average height of these 4 students in cm?
三年级4名学生的身高是135cm、128cm、117cm、120cm这4名同学的平均身高是多少cm．
<gadget id="calculator">135 + 128 + 117 + 120</gadget>
<output>500</output>

<gadget id="calculator">500 / 4</gadget>
<output>125</output>

<result>125</result>