There are 120 students in the fourth grade, which is 40 less than the total number of students in the whole school (2/5). How many students are there in the whole school?
四年级有学生120人，比全校学生的总人数的(2/5)少40人，全校有多少人？
<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>