There are 120 students in the first grade, which is twice the number of students in the second grade and less than 40 students. How many students are there in the second grade?
一年级有学生120人，是二年级学生人数的2倍少40人，二年级有学生多少人？
<gadget id="calculator">40 + 120</gadget>
<output>160</output>

<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<result>80</result>