Day-of-week inference – Mohini watched a movie exactly nine days ago and she only goes to the movies on Thursdays. What day of the week is today?

Introduction / Context:
We are given a fixed weekday for an event that occurred a specific number of days earlier. The task is to roll that weekday forward by the stated gap to arrive at today.

Given Data / Assumptions:

• Mohini visits the cinema only on Thursdays.
• Her last visit was nine days ago.
• We need to find today’s weekday.

Concept / Approach:
If nine days ago was a Thursday, then today is Thursday + 9. Because 7 days = one full week, add 9 as 7 + 2 → the weekday advances by 2 relative to Thursday.

Step-by-Step Solution:
Nine days ago = Thursday.Advance 7 days: still Thursday.Advance 2 more days: Thursday → Friday → Saturday.

Verification / Alternative check:
Count backwards from the proposed today: If today is Saturday, then 9 days earlier lands on Thursday (Saturday − 9 = Thursday), consistent with the rule that she only goes on Thursday.

Why Other Options Are Wrong:
Thursday would be 7 or 14 days apart, not 9. Sunday or Tuesday miscount the extra two days beyond a full week.

Common Pitfalls:
Subtracting 9 instead of adding 9, or forgetting to reduce the 9-day gap modulo 7 first.

Final Answer:
Saturday