We have three jars one of 12-liter one 7-liter and one 5-liter. The 12-liter jar is full of water and the 7-liter with the 5-liter jar are empty. How do you get 6 liters of water using the two jars?

Answer 1

1)Transfer 7 liters from the 12-liter jar into the 7-liter jar.

We now have 5 liters in the 12-liter jar and 7 liters in the 7-liter jar. The 5-liter jar is empty, as of now.

2)Transfer 5 liters from the 7-liter jar into the 5-liter jar.

The 12-liter, 7-liter, 5-liter jars now contain 5, 2 and 5 liters respectively.

3)Empty the contents of the 5-liter jar into the 12-liter jar.

The 12, 7, 5- liter jars now contain 10, 2 and 0 liters respectively.

4)From the 7-liter jar, take out 5 liters and pour 7 liters from the 12-liter jar into the 7-liter jar.

We now have 3 liters in the 12-liter jar and 7 in the 7-liter one, while the 5-liter jar has only two liters in it.

5)Fill up the remainder of the 5-liter jar using the 7-liter jar.

That leaves us with 3 liters on the 12-liter jar and 4 liters in the 7-liter jar. The 5-liter jar is full.

6)Pour the contents of the 5-liter jar into the 12-liter jar.

There are 8 liters in the 12-liter jar and 4 liters in the 7-liter jar, while the 5-liter jar is empty.

7)Pour the 4 liters that are in the 7-liter jar into the 5-liter jar.

We now have 8 liters in the 12-liter jar and 4 liters in the 5-liter jar. The 7-liter jar is empty.

8)Fill the 7-liter jar using the 12-liter jar.

There is now only 1 liter in the 12-liter jar and 7 liters in the 7-liter jar and 4 liters in the 5-liter jar.

9)Fill up the 5-liter jar using the 7-liter jar.

There is now 1 liter in the 12-liter jar and 6 liters in the 7-liter jar and 5 in the 5-liter jar.

NOTE: This might not be the only way, or the shortest way to do it.