Today is Saturday. A person wants to meet a lawyer and as that lawyer is busy he asks him to come three days after the before day of the day after tomorrow. On which day the lawyer asks the person to come?
The lawyer asked him to come on Wednesday.
If today is Saturday, “day after tomorrow” is Monday. Therefore, “before day of the day after tomorrow” is Sunday. So, “three days after the before day of the day after tomorrow” means “3 days after Sunday”, which is Wednesday.