其它
Anna is lining up to get some ice-cream. Counting from the front, she is the $$4$$\textsuperscript{th}~in the line. Counting from the back, she is the $$7$$\textsuperscript{th}. How many people are there lining up?~\uline{~~~~~~~~~~}~ 
Overseas Competition->Knowledge Point->Word Problem Modules
$$4+7-1=10$$ 