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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Hint
Start by filling the 7 gallon container.
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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