If the day before yesterday was Friday, what will be the third day after the…

Concept:

Relative day terms are fixed integer shifts from today. “Day before yesterday” is today − 2, “yesterday” is − 1, “tomorrow” is + 1, and “day after tomorrow” is + 2. “The n-th day after a given day” means add n to that day. Because the week repeats every 7 days, you can add all the shifts and take the result modulo 7.

Application:

1. Anchor today. The day before yesterday is today − 2, and it equals Friday. So today = Friday + 2 = Sunday.

2. Find the day after tomorrow. That is today + 2 = Sunday + 2 = Tuesday.

3. Move the third day after it. Add 3 to Tuesday: Tuesday + 3 = Friday.

Cross-check:

Combine the shifts as a single step from the Friday anchor: (+2 to reach today) + (+2 to reach the day after tomorrow) + (+3) = +7. Adding 7 days is one full week, so the result lands back on Friday — the same day the puzzle started from. This confirms the answer is Friday.