Teacher Liu has to give art classes to 3 classes every day. The number of students in each class is about 38 to 42. How many students does Teacher Liu have to teach every day?
刘老师每天要给3个班上美术课，每个班的学生人数大约是38～42人之间，刘老师每天大约要给多少个学生上课．
<gadget id="calculator">3 * 40</gadget>
<output>120</output>

<result>120</result>