Pip was the $${{8}^{\text{th}}}$$ in a queue counting from front to back.  Bud was the $${{10}^{\text{th}}}$$ from the end of the queue.  Pip is in front of Bud, and there were $$4$$ children between them,  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