A Crowded Class

A crowded class was having English with extra twenty students, two classes in one classroom. The students were doing a lot of noise, so the teacher ordered, ´Leave the classroom`. Everyone started clapping. Refusing to teach classes with noise, he threatened, ´If you don´t stop talking, many of you will go out. See students continue talking, so he invited six of them to go out. After begging for silence he ordered, ´More five go out`. Finally, there was silence in the classroom but only for a few minutes, then all the students started talking again. In the final ten minutes of the class only ten students stayed in the classroom. However, the complete silence was achieved when there was no one there.