Question:
If the first day of a month is Thursday, which of the following would be the fifth day from the 16th of that month?
If the first day of a month is Thursday, which of the following would be the fifth day from the 16th of that month?
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Always count the start date as day zero to avoid "off-by-one" errors.
Updated On: Jun 5, 2026
- Wednesday
- Thursday
- Friday
- Saturday
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The Correct Option is A
Solution and Explanation
Concept:
Calendar problems are solved using modular arithmetic (days of the week cycle every 7 days).
Step 1: Identify the target date.
The fifth day from the 16th is $16 + 5 = 21$st.
Step 2: Calculate the day.
- 1st is Thursday. - 8th (1+7) is Thursday. - 15th (8+7) is Thursday. - 16th is Friday. - 21st is 5 days after 16th: $16 \to 17(Sat), 18(Sun), 19(Mon), 20(Tue), 21(Wed)$. equation Day = Wednesday equation center Wednesday center
Step 1: Identify the target date.
The fifth day from the 16th is $16 + 5 = 21$st.
Step 2: Calculate the day.
- 1st is Thursday. - 8th (1+7) is Thursday. - 15th (8+7) is Thursday. - 16th is Friday. - 21st is 5 days after 16th: $16 \to 17(Sat), 18(Sun), 19(Mon), 20(Tue), 21(Wed)$. equation Day = Wednesday equation center Wednesday center
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