There are 120 fifth grade students, which is 40 less than the number of students in the whole school (2/5). What is the correct formula for the number of students in the whole school?
五年级学生120人，比全校学生数的(2/5)少40人，求全校学生人数的正确列式是多少
<gadget id="calculator">120 + 40</gadget>
<output>160</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">160 / (2/5)</gadget>
<output>400</output>

<result>400</result>