Four Gallon Puzzle
This is a classic you may have read about before. You are next to a pond, and for whatever reason (okay, I forgot the reason) you need to have exactly four gallons of water in your bucket. The problem is that you have a bucket that holds exactly three gallons, and one that holds exactly five gallons, and they have no marks for lesser amounts.
Can you think of a fast efficient way to measure out exactly four gallons of water?
Answer at the End!
Riddle Answer: Fill the three-gallon bucket, pour it into the five-gallon one, then fill the small one again. This time when you pour the water into the larger one, there will only be space for two more gallons (3+2 = 5), so one gallon will remain. Dump out the five-gallon bucket and pour the gallon of water into it. Now just fill the three-gallon one again and add it to the gallon in the larger bucket. You'll have exactly four gallons.
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