Three cannibals and three missionaries want to cross...?

Question

a river in a canoe which only holds two people. One person has to bring the boat back (it can't be pushed, etc.). The trouble is, if there are ever more cannibals than missionaries the cannibals will eat the missionaries. How can the six get safely across?

Answer 1

They can cross the river as shown in the following schematic. M = missionary, C = cannibal, {} = boat.



MMMCCC {}
MMMC -> {CC}
MMMC {} CC
MMMC {C} <- C
MMMCC {} C
MMM -> {CC} C
MMM {} CCC
MMM {C} <- CC
MMMC {} CC
MC -> {MM} CC
MC {} MMCC
MC {MC} <- MC
MMCC {} MC
CC -> {MM} MC
CC {} MMMC
CC {C} <- MMM
CCC {} MMM
C -> {CC} MMM
C {} MMMCC
C {C} <- MMMC
CC {} MMMC
-> {CC} MMMC
{} MMMCCC

Answer 2

Bring a cannibal over, then go back and get a missionary, bring the cannibal back but leave the missionary, grab another missionary and bring him to the other side, you grab a cannibal and bring him back and then grab the other and then go back for the other and all three are there safely (if you're driving the boat) check ya later ♥

Answer 3

First 2 cannibals circulate together and one brings back the canoe. the 2d time a cannibal and a missionary circulate over together and the cannibal brings back the canoe. on the 0.33 holiday a cannibal and missionary circulate, and the missionary remains. so a techniques there are 2 missionaries and a cannibal on the different facet, a cannibal interior the canoe, and a cannibal and a missionary on my own on the facet they started...nevertheless with me? on the fourth holiday a cannibal and a missionary circulate over and the cannibal is left. The missionary rows back and selections up the final cannibal and that they row to the different facet...all six are there together.

Answer 4

1 Carni and 1 Missi
Missi come back

2 Carni
1 Carni comes back

2 Missi
1 Carni and 1 Missi comes back

2 Missi
1 Carni (the one left on the other side) come back

Now u have 3 Missi at the other side, the rest is easy.

Answer 5

Find a bridge!