A river crossing puzzle goes as follows. Three humans, one big monkey and two small monkeys are to cross a river:
Only humans and the big monkey can row the boat.
At all times, the number of humans on either side of the river must be greater or equal to the number of monkeys on that side. (Or else the humans will be eaten by the monkeys!)
A river crossing puzzle goes as follows.
Three humans, one big monkey and two small monkeys are to cross a river: