There are $$20$$ students in a class standing in a line for recess. Mike is the $$7$$\textsuperscript{th} counting from front to back. How many students are behind Mike? What is his position counting backwards? 
Overseas Competition->Knowledge Point->Counting Modules->Law of Addition and Multiplication->Queuing Problems
The number of students behind Mike plus the position of Mike equals the total number of students in the class. So there are $$13$$ students behind Mike: $$20-7=13$$. However Mike is not included in these $$13$$ students, which means Mike is the $$14$$\textsuperscript{th} student counting from back to front. 