How do you get six from seven and five. Cave puzzle solution?

Answer 1

First fill 5 litre and pour it into 7 Litre.

Then again fill 5 litre and pour to 7 litre.

Now 3 litres are left in 5 litre container.

Empty 7 litre and pour 3 litre in it.

Again fill 5 litre and pour in 7 litre.

Now 7 litre is full and 1 liter left in 5 liter container.

Empty 7 litre and pour 1 litre which is left in 5 litre container.

Now 1 litre is already in 7 litre container, now fill 5 litre and pour into 7 litre container.

now it is 6 litre in 7 litre container.

DONE!