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Puzzle - Answer

Using a tap, a nine gallon container and a four gallon container, can you measure exactly 6 gallons?

 [Ref: ZVOM] © Kevin Stone

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

This leaves 6 gallons in container A.

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