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The parity (odd or even) of days depends on the number of days in a month - not the number of days in a week.
by their nature the days of the week by name are neither even or odd. The numerical day of the month a day falls on can be either even or odd. Note that a month with 31 days will have an odd day at the end of month followed immediately by another odd day. This never happens for even days.
If the question refers to the days of the week, then there are the same number for each day of the week.
7 days in a week
A week is 7 days. Therefore, a week and a half would be 10.5 days.