Answer
Here are the contents of the containers after each stage:
A B
0 11 fill B
7 4 fill A from B
0 4 empty A
4 0 fill A from B
4 11 fill B
7 8 fill A from B
0 8 empty A
7 1 fill A from B
0 1 empty A
1 0 fill A from B
1 11 fill B
7 5 fill A from B
0 5 empty A
5 0 fill A from B
5 11 fill B
7 9 fill A from B
0 9 empty A
The legendary BrainBashers calendar had a recent bug. Here is a listing showing the number of days in each month:
January 107
February 68
March 135
April 15
May 133
June 104
July 104
August 16
September ?
Take the first letter of the month, and find its position in the alphabet: S = 19.
Then take the number of letters in the month: September = 9.
January 10 7
February 6 8
March 13 5
April 1 5
May 13 3
June 10 4
July 10 4
August 1 6
September 19 9