How many times per year does a triple calendar need to be adjusted?

A triple calendar watch features three calendar functions: date, day of the week, and month. Unlike standard watches that may only require adjustments for the date, a triple calendar must be adjusted more frequently due to the varying lengths of months.

The typical year includes 12 months, and since some months have 30 days and others have 31, a triple calendar watch would require adjustments at the end of the months that do not have 31 days. Specifically, this means making adjustments at the end of February (which typically has 28 days) and the months of April, June, September, and November (which each have 30 days).

Thus, in a typical year, a triple calendar would need to be adjusted for the months that do not have 31 days. This results in a total of five adjustments per year, accounting for four months with 30 days and one for February. This understanding of the triple calendar’s operation underlies why five is the correct answer, reflecting the requirement to keep the calendar accurate throughout the year.