Solved IB ACIO Question
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Q · Calendarmedium · 45s
On which day of the week does December 31, 2025, fall, if January 1, 2025, was a Wednesday?
TopicCalendar
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.25
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
2025 is not a leap year (365 days). 364 days passed after Jan 1 to Dec 31. 364 mod 7 = 0, so same day Wednesday.
Final Answer: Option B — Wednesday