Lianjiao Primary School has a total of 280 students. The number of second grade students is 1/7 of the total number of students in the school. How many students are there in second grade?
联滘小学共有学生280，二年级学生数是全校学生总数的(1/7)，二年级有学生多少人？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">280 * (1/7)</gadget>
<output>40</output>

<result>40</result>