There are 3 demons and 3 civilians.They all have to cross a river in a boat. Boat can only carry two head at a time. As long as there are equal number of demons and civilians, demons will not eat civilians. If the number of demons are greater than the number of civilians on the same side of the river then demons will eat the Civilians.So how can we make all the 6 peoples to arrive to the other side safely?
Answers
Answer:
Solution:
To arrive all the priests and devils to the other side, 6 steps are to be followed:-
1) Firstly one devil and one priest will go to the other side. Devil will stay to the other side while priest will come back with the boat.
2) Remaining two devils will go to the other side. One devil will stay to the other side while one devil will come again with the boat.So total two devils are on the another side of river and 3 priests and 1 devil is on the one side of the river.
3) Now two priests will go. One priest will stay while 1 priest and 1 devil come back with the boat.
4) Now remaining two priests will go to the other side of the river. Total 3 priests and 1 devil is on the one side while 2 devils is on the another side of the river. 1 devil will come back with the boat.
5) 2 devils will go to the other side of the river. 1 devil will stay and 1 devil will again go back with the boat.
6) Now the remaining 2 devils will come to the other side of the river.
All the 3 priests and 3 devils arrive safely