You have a 3-gallon jug and a 5-gallon jug, and you need to measure out exactly 4 gallons. How do you do it?
Category: Brain Teasers · Difficulty: hard
Hint: Think about how you can use the jugs to measure the difference.
Answer
Fill the 5-gallon jug and pour into the 3-gallon jug until full, then empty the 3-gallon jug and pour the remaining 2 gallons back into it. Fill the 5-gallon jug again and pour into the 3-gallon jug until it is full, leaving exactly 4 gallons in the 5-gallon jug.
Explanation
This riddle involves strategic filling and pouring to achieve the exact measurement using the two jugs.
This is a hard brain teasers riddle — a tricky one that takes a little thought. The answer is Fill the 5-gallon jug and pour into the 3-gallon jug until full, then empty the 3-gallon jug and pour the remaining 2 gallons back into it. Fill the 5-gallon jug again and pour into the 3-gallon jug until it is full, leaving exactly 4 gallons in the 5-gallon jug..
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