self Maths Puzzle

3 missionaries and 3 obediant but hungry cannibals have to cross a river using a 2-man rowing boat. If on either bank cannibals outnumber missionaries the missionaries will be eaten. How can everyone cross safely?

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self Other Question

30 passengers are in a sinking ship. They all stand in a circle. Every 9th passenger goes overboard. The lifeboat holds 15. Where are the 15 lucky positions in the circle? 2 men and 2 boys need to cross a river in a boat big enough for 1 man or 2 boys. How do they do it?