Counting from the front, Mark was the $${{8}^{\text{th}}}$$ in a queue.  Helen was the $${{9}^{\text{th}}}$$ from the end of the queue.  There were $$6$$ children between Mark and Helen in the queue with Mark in front of Helen.  How many children were there in the queue? 
Overseas Competition->Knowledge Point->Word Problem Modules->Problems Involving Queuing->Finding the Total Number According to the Position of Two Characters in a Line