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
This leaves 9 gallons in container B.
??
Puzzle 18
My first is in kendo, but not in squash.
My second is in hurdles, and in hunting.
My third is in bowman, and in bowling.
My fourth is in cycling, and in golf.
My fifth is in flying, and not in swimming.
My last is in running, and not in dancing.
My whole is a sport.
Reasoning
The 1st letter can only be: D E K N O
The 2nd letter can only be: H U
The 3rd letter can only be: B N O W
The 4th letter can only be: G L
The 5th letter can only be: F L Y
The 6th letter can only be: R U
?
Puzzle 19
Can you find every occurrence of the word MARCH that appears in this grid (horizontally, vertically, or diagonally)?
The hint will reveal the number of times it occurs, but where are they?
Note: this puzzle is not interactive, and the letters cannot be selected.
Hint
Start by filling the 9 gallon container, and then use that to fill the 4 gallon container.
Answer
Here are the contents of the containers after each stage:
A B
9 0 fill A
5 4 fill B from A
5 0 empty B
1 4 fill B from A
1 0 empty B
0 1 fill B from A
9 1 fill A
6 4 fill B from A
6 0 empty B
