202
It depends... Which months of which year?
How many days in 2009 without weekends
158
about 180
40
Any month that starts on a Saturday, with 30 days in the respected month, or on a Saturday or a Friday, in months with 31 days.
about 180
This would vary with the particular calendar months involved, but for 9 contiguous months it would have to be either 39 or 40 weekends (272 to 276 days). e.g. January 1 to September 30 would be 39 full weekends, April 1 to December 31 could include 40 weekends.
Any month with 30 or 31 days can have 5 weekends (Sat-Sun) if it starts on a Saturday - for 30 day months - or a Friday or Saturday - for 31 day months. Months with only 4 weekends are any February, or any month that does not start on a Friday or Saturday. A non-leap year calendar year will have either 52 or 53 weekends, and will have either 2 or 3 months with 5-day weekends.
3 months had five Sat-Sun weekends in 2011: January, July, and October.
There are approximately 260 days in a typical year that aren't weekends. My math: 365 days / 7 days a week = 52.14 weeks 7 days in a week - 2 weekend days = 5 week days 52.14 * 5 week days = 260.71
5