There are 4 classes in the third grade of a certain school, and the number of students in each class is equal. Now 25 students are selected from each class to participate in the rehearsal of the sports meeting. Number of people, how many students are there in each class.
某校三年级共有4个班级，且每班人数相等，现在从每班选出25名同学参加运动会入场排练，则4个班级中剩下的同N学人数刚好等于原来2个班的总人数，每班有多少位同学．
<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<result>50</result>