You have a 5-litre jug and a 3-litre jug, with no measurement markings, and unlimited water. You are not allowed to make any markings either. How can you measure exactly 4 liters? 
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The 4-Litre Mystery: Can Your Brain Crack This Water Puzzle?
- Thread starter AudaciousAlpha
- Start date
Fill 5 ltr jug
Pour water in 3 ltr jug from 5 ltr jug
In 5trl remains 2 ltr. Mark it on 5ltr jug
Empty 3 ltr jug. Pour water from five ltr jug. i.e. 2 ltrs.
Fill 5 ltr jug to the marking of 2 ltrs and pour 2 ltrs in 3 ltr jug into 5 ltr jug .
4 ltr of water in 5 ltr jug
Yes, the idea is creative, but the answer is not correct under the original rules.The problem says the jugs have no measurement markings.
It doesn't have, but doesn't say you cannot make one
Now again you have specific answer in mind. So keep changing rules.
Exactly! The question never said we couldn’t make our own markings! You didn’t just solve the puzzle—you found a loophole in it! Touché!
I am not a problem solver but solution finder... its not logic, its being creative...Exactly! The question never said we couldn’t make our own markings! You didn’t just solve the puzzle—you found a loophole in it! Touché!
There is no box to think out of the box
Haha, I love that perspective! Sometimes creativity finds solutions where logic sees limitations. Keep thinking differently!
Have you read lateral thinkingHaha, I love that perspective! Sometimes creativity finds solutions where logic sees limitations. Keep thinking differently!
Edward de bono propagated it.
Thank you for the kind suggestion! I appreciate the reminder and will make sure to post puzzles in the right section next time.
I’ve heard about it, and it sounds really interesting!
There’s always something new to learn from different ways of thinking. Thank you for sharing!
Fill the 5L jug and use the 3L jug to remove exactly 1L at a time. Simple maths complicated jugs.....
Haha! The maths is innocent, but those jugs are making it a full-time engineering project! 
You have a 5-litre jug and a 3-litre jug, with no measurement markings, and unlimited water. You are not allowed to make any markings either. How can you measure exactly 4 liters?
Fill the 5-litre jug completely.
Pour water into the 3-litre jug until it is full. You will have 2 litres left in the 5-litre jug.
Empty the 3-litre jug and pour the remaining 2 litres into it.
Fill the 5-litre jug again.
Pour water from the 5-litre jug into the 3-litre jug until it is full. Since the smaller jug already contains 2 litres, it needs only 1 more litre.
Exactly 4 litres remain in the 5-litre jug.
Pour water into the 3-litre jug until it is full. You will have 2 litres left in the 5-litre jug.
Empty the 3-litre jug and pour the remaining 2 litres into it.
Fill the 5-litre jug again.
Pour water from the 5-litre jug into the 3-litre jug until it is full. Since the smaller jug already contains 2 litres, it needs only 1 more litre.
Exactly 4 litres remain in the 5-litre jug.
Brilliant! You made those complicated jugs surrender to simple maths!
You made those complicated jugs surrender to simple maths!
Brilliant!
Thank You
Thank You
You're most welcome..