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Measure 4 litre of water using a 3 litre jar and a 5 litre jar

Solution 1

1. Fill the 3 liter jar and pour it into the 5 liter jar.
2. Do it again,
3. Now in the 3 liter jar you will be left with one litre.
4. Throw away the 5 liter jar water.
5. Pour the one litre it into 5 litre
6. Fill the 3 liter jar and pour it into the 5 liter jar.
7. Now the 5 liter jar has 4 liters

Solution 2

1. Fill the 5 litre jar and pour it into the 3 litre jar
2. Now you have 2 litres in the 5 litre jar
3. Pour the 2 litres it into 3 litres jar
4. Fill the 5 litre jar and pour it into the 3 litre jar till it becomes full
5. Now you will have 4 litres in the 5 litre jar