-- Oil and water problem!!..:S - Pour mixture into the 43 litre container!!that would make 30 litre oil and 13 litre water!! - Now Take 11 litre container and pour the water remaining in the first container i.e. 60 litre container into it and pour the rest of water into another 7 litre container!!Now there will be 6 litre water in 7 litre container!! - Take the water in 11 litre and 43 litre containers and pour them into 60 litre container!! That makes 24 litres of water and 30 litres of oil!! - Now pour water in 6 litre container into the 43 litre container!! -and pour the water in 60 litre container from bottom into 7 litre container!! Now remainig mixture is 30 litre oil and 17 litre water!! - Pour the 7 litre water into 43 litre container and take out 11 litre water into 11 litre container from it!! - Put 11 litre in 60 litre container!! That makes it 30 litre of oil and 28 litre of water!! -- Now as u have 7 litre container, u can easily separate 28 litre water from that mixture!! -- Voila the problem is solved!! :) Thank you!!..:p