Fill a 5 litre tub with exactly 4 litre? You have only a 3 litre and a 5 litre tub without any measurements/apparatus?

Question

This was the question of two buckets of 3 and 5 litres each. Now measure four litre. I had given 2 solutions but still he wanted 3 solution.
1st soln: fill 3 litre and then interchange in various ways to get 4 litre.
2nd soln: fill 5 litre and then interchange in various ways.

Answer 1

There are two ways to solve this, maybe the question could be modified to say the 5 litre can doesn't fit under the tap...

Number 1

(1)Fill the 5 litre can from the tap
(2)Empty the 5 litre can into the 3 litre can - leaving 2 litres in the 5 litre can.
(3)Pour away the contents of the 3 litre can.
(4)Fill the 3 litre can with the 2 litres from the 5 litre can - leaving 2 litres in the 3 litre can.
(5)Fill the 5 litre can from the tap.
(6)Fill the remaining 1 litre space in the 3 litre can from the 5 litre can.
(7)Leaving 4 litres in the 5 litre can.

Number 2

(1)Fill the 3 litre can from the tap.
(2)Empty the contents of the 3 litre can into the 5 litre can.
(3)Fill the 3 litre can from the tap.
(4)Empty the contents of the 3 litre can into the 5 litre can. - Leaving the 5 litre can full and 1 litre in the 3 litre can.
(5)Pour away the contents of the 5 litre can
(6)Pour the 1 litre from the 3 litre can into the 5 litre can.
(7)Fill the 3 litre can from the tap.
(8)Empty the contents of the 3 litre can into the 5 litre can.
(9)Leaving 4 litres in the 5 litre can.