Question: There is a boat which can only support 80 kilos weight transport. A man has 2 sons. Man weighs 80 kilos and both sons are 40 and 40 kilos. They want to go to the Island with this boat, but going there together adds up to 160 kilos? What should they do to get them all on the Island?
Answer: First son should go because they each weigh 40 kilos. One son should stay behind on the Island while the other should come back for their father. The father then takes the boat alone to the Island and stay there so other son can take it again and to go pick his brother. Finally they are on the Island.