If the day after tomorrow is Sunday, then what day was “tomorrow’s day before yesterday”? (Assume standard consecutive days.)

Introduction / Context:
This is a verbal logic/calendar question testing careful parsing of relative-day phrases.

Given Data / Assumptions:

• “Day after tomorrow” = Sunday.

Concept / Approach:
Let today be T. If T + 2 = Sunday, then T = Friday.

Step-by-Step Solution:
Tomorrow = T + 1 = Saturday.“Tomorrow’s day before yesterday” = (T + 1) − 2 = T − 1 = Thursday.

Verification / Alternative check:
Enumerate: Thu (T − 1), Fri (T), Sat (T + 1), Sun (T + 2). Works.

Why Other Options Are Wrong:
Friday/Monday/Tuesday result from offset mistakes (±1 error).

Common Pitfalls:
Reversing “tomorrow’s day before yesterday” as “day before tomorrow” (which would be today).

Final Answer:
Thursday