If the day after tomorrow is Saturday, then what day of the week was three days before yesterday?

Introduction / Context:
This is a calendar based reasoning question. You are given information about the day after tomorrow and asked to find a day relative to yesterday. You must mentally move forwards and backwards along the days of the week in the correct order. These questions check your ability to handle relative time expressions such as “day after tomorrow” and “three days before yesterday”.

Given Data / Assumptions:

• The day after tomorrow is Saturday.
• We need to find which day was three days before yesterday.
• The standard order of days is Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday, repeating in a cycle.
• There is no change of calendar or any special holiday; the days follow normally.

Concept / Approach:
The idea is to first determine what today is by using the information about the day after tomorrow. Once you know today, you can move to yesterday and then go three days backwards. It is important to move step by step rather than trying to jump directly from the given statement to the required day. Working with a small mental time line of days helps reduce confusion.

Step-by-Step Solution:
Let us denote today by T. The day after tomorrow is two days ahead of today, that is T + 2. We are told that T + 2 is Saturday. Therefore T is two days before Saturday. Counting backwards, the day before Saturday is Friday, and the day before that is Thursday. Hence today is Thursday. Yesterday is one day before today, so yesterday was Wednesday. Three days before yesterday means we move three days back from Wednesday. One day before Wednesday is Tuesday, two days before is Monday, and three days before is Sunday. Thus, three days before yesterday, the day was Sunday.

Verification / Alternative check:
We can verify by building a small table. If today is Thursday, then tomorrow is Friday and the day after tomorrow is Saturday, which matches the given statement. Yesterday would then be Wednesday. Going backwards from Wednesday: one day before is Tuesday, two days before is Monday and three days before is Sunday. Every step fits the normal weekly order, so the answer is consistent and correct.

Why Other Options Are Wrong:
Monday would be only two days before Wednesday if we count Wednesday to Tuesday, Tuesday to Monday. Tuesday is one day before Wednesday, not three. Thursday and Friday are actually at or after today, while we need a day earlier than yesterday. Only Sunday is exactly three days before Wednesday when today is Thursday.

Common Pitfalls:
Many candidates confuse “day after tomorrow” with “tomorrow” or forget to count carefully when moving multiple days forwards or backwards. Another common mistake is to miscount steps, for example stopping after two steps when three are required. Keeping a simple mental or written list of days and marking each movement prevents these errors.

Final Answer:
Three days before yesterday, the day of the week was Sunday.