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Fourth grade olympiad math problem. Some college students can't do it!
Talk about my thinking of solving problems under 1

1. The police drove the criminal there and the police came back.

The police drove his son 1 away, and the police drove the criminal back.

The father took his son there, and then the father came back.

4. Mom and Dad walked over and mom came back.

The police drove the criminal there and his father came back.

6. Mom and Dad walked over and mom came back.

7. The mother drove her daughter 1 and the police drove the criminal back.

8. The police drove their daughter there, and then the police came back.

The police drove the criminal there. ...

(1 OK, please draw a picture to think about this problem. There is no mistake in my method, thank you! )

Please don't copy the answers behind the hymn! thank you