Lol the Incredible Hock just loves to ask IQ questions.
I guess it is probably to boost his ego when others cannot answer xD.
Come on hock, you are intelligent enough (though not as smart as the bui).
You don't have to resort to annoying IQ questions to raise your self esteem!
Sorry Hock,
The amazing Bui is gonna post the answer right here for everyone.
Firstly, you fill the 5 litre jar.
Fill the 3 litre jar full from the 5 litre one.
So, now you have:
2 litres in the 5 litre jar.
Pour all the water from the 3 litre jar away.
Pour the 2 litres from the 5 litre jar into the 3 litre jar.
Next, fill the 5 litre jar again.
Fill the 3 litre jar. (It already has 2 litres inside so you would only need 1 litre)
Which means, the 5 litre jar now has 4 litres!
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