This riddle is slightly different from the puzzle with wolf goat and cabbage. It is a bit more complicated.
Cannibals
A river. Three cannibals and three missionaries are standing on one bank. There is a boat with maximum capacity of two people. How do they get to the other side so that missionaries are never outnumbered by cannibals on any bank?
Hint
There can be two people on the boat even on the way back or someone who has already been on the other side can go back. Try to draw the situation.
Answer
Cannibal and missionary there (or two cannibals). Missionary back (cannibal).
Two cannibals there one back.
Two missionaries there. Missionary and cannibal back.
Two missionaries there.
Now three missionaries and a cannibal moved to the other bank. The cannibal can now travel his friends one by one.