Weekly Cycle Logic

The days of the week repeat predictably in a cycle of 7 days.

Calculating 28 Days Prior

The question asks for the day of the week that occurred 28 days before a Tuesday.

To find this, we calculate how many full weeks are contained within 28 days:

$ \frac{28 \text{ days}}{7 \text{ days/week}} = 4 \text{ weeks} $

Since 28 days constitutes exactly 4 full weeks, the cycle of days brings us back to the same day of the week.

Final Day Determination

Therefore, if today is Tuesday, the day 28 days ago was also Tuesday.