Calendar / first working day logic: Ketan takes casual leave only on the first working day of every month. Saturdays and Sundays are weekly offs. In a 30-day month, the first working day was Tuesday. On which day will his next month’s casual leave fall?

Introduction / Context:
We are to shift the calendar from one month to the next, respecting the 7-day cycle and identifying the next month’s first working day (non-Sat/Sun).

Given Data / Assumptions:

• This month has 30 days.
• This month’s first working day is Tuesday (hence the 1st is Tuesday and is a working day).
• Sat/Sun are off; all other weekdays are working.

Concept / Approach:
Day-of-week advances by (month_length mod 7). For a 30-day month, the next month’s 1st is 2 weekdays ahead of this month’s 1st.

Step-by-Step Solution:

Verification / Alternative check:
Enumerate: Tue(1st), …, the following month’s 1st indeed lands on Thu with a 30-day shift.

Why Other Options Are Wrong:
They correspond to incorrect mod-7 shift or assume weekends interfere (they do not, since Thu is not a weekend).

Common Pitfalls:
Forgetting that only the first day’s weekday matters; weekend filtering applies only if the first lands on Sat/Sun.

Final Answer:
Thursday