There are six classes in the fifth grade, and the number of each class is equal. From each class, 16 students are selected to participate in the mathematics competition. The remaining students are equivalent to the number of the original 4 classes.
五年级有六个班，每班人数相等，从每班选16人参加数学竞赛，剩下的同学相当于原来4个班的人数，原来每班多少人．
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">16 * 3</gadget>
<output>48</output>

<result>48</result>