Laura was $${{4}^{\text{th}}}$$ in a queue.  Amanda was $${{7}^{\text{th}}}$$ from the end of the queue.  There were $$2$$ children queuing between Laura and Amanda. Laura is in front of Amanda.  How many children were there in the queue? 
Overseas Competition->Knowledge Point->Counting Modules->Law of Addition and Multiplication->Queuing Problems