If the day before the day before yesterday was Monday what is the day after the day after tomorrow?

Sunday.

Why?

The day before the day before yesterday was Monday

implies that today is Thursday.

This is true because the 'day before yesterday (Wednesday)' would be Tuesday, and the day before Tuesday is Monday.

Since today is Thursday, that means that the "day after tomorrow(Friday)" is Saturday, and the day after that is Sunday.

***

uh, that is incorrect.

if TODAY is WEDNESDAY, then YESTERDAY would be TUESDAY, and the DAY BEFORE that would be MONDAY.

now that we've established that TODAY is WEDNESDAY, then TOMORROW would be THURSDAY, and the DAY AFTER would be FRIDAY. so the ANSWER IS FRIDAY.

***

never mind. misread the question.