arithmetic
posted by Kesha .
If you treat the day of the month as a number (March 12th is the number 12, April 4th is the number 4), what is the average value of the numbers that represent the 6 Tuesdays that fall after September 12, 2011?

They days are
13, 20, 27, 4, 11, 18
Add them up and divide by 6.