Weekend-day counts — If December of a certain year has exactly 9 weekend days (Saturdays and Sundays), how many weekend days did January of that same year have?

Introduction / Context:Counting weekend days (all Saturdays and Sundays) across months requires careful attention to the calendar layout. The question links December's weekend count to January of the same year.

Given Data / Assumptions:

• December has exactly 9 weekend days.
• “Weekend” means Saturdays + Sundays (individual days, not pairs).
• We want January's weekend-day count of the same year.

Concept / Approach:January and December are 11 months apart. Depending on where weekdays fall and whether the year is leap or common, January can have either 8 or 10 weekend days while December has 9. There is no unique single value constrained by “December = 9.”

Step-by-Step Solution:

Verification / Alternative check:Test multiple Gregorian years: some with December=9 yield January=8; others yield January=10. Hence non-unique.

Why Other Options Are Wrong:

• 8 and 10 can both be correct depending on the year; since the item expects exactly one correct option, selecting either alone would be misleading.
• 9: January having 9 with December=9 is not guaranteed and is not the only outcome.

Common Pitfalls:

• Confusing “weekend days” with “weekends as pairs.”
• Assuming a unique answer without checking calendar variants.

Final Answer:None of these (January can be 8 or 10 weekend days).