1. Students line up to do exercises. Seen from the front, Xiaohong ranks fifth, and there are three people behind Xiaohong. How many people are there in this team?

2. Students line up to do exercises. Xiaohong has three people in front and four in the back. How many people are there in this team?

3. Students line up to do exercises. From the front, Xiaohong ranks fifth, and from the back, Xiaohong ranks fourth. How many people are there in this team?

4.20 Children do exercises in teams. From the front, Xiaohong ranks sixth, so from the back, where is Xiaohong?