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Puzzle ZZMQ 



?

Using a 3 gallon container and a 7 gallon container (along with a water source and drain)...

...can you measure exactly 5 gallons?

Puzzle Copyright © Kevin Stone

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Answer
Here are the contents of the containers after each stage:
A  B
0  7     fill B
3  4     fill A from B
0  4     empty A
3  1     fill A from B
0  1     empty A
1  0     fill A from B
1  7     fill B
3  5     fill A from B
0  5     empty A

This leaves 5 gallons in container B.

 

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