The sixth grade students of a certain elementary school were divided into two groups on average to participate in the tree planting activity. The first group of students planted 2 trees on average, and the second group of students planted 3 trees on average. It is known that the two groups of students planted 280 trees in total. How many students are there in the sixth grade of this elementary school?
某小学六年级学生平均分成两批参加植树活动，第一批学生平均每人种树2棵，第二批学生平均每人种树3棵．已知两批学生一共植树280棵，问这个小学六年级有多少个学生？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">280 / 5</gadget>
<output>56</output>

<gadget id="calculator">56 * 2</gadget>
<output>112</output>

<result>112</result>