Cross the river
Written on 9:53 am by Vja Students
Three humans and three monkeys (one big, two small) need to cross a river. But there is only one boat, and it can only hold two bodies (regardless of their size), and only the humans or the big monkey are strong enough to row the boat. Furthermore, the number of monkeys can never outnumber the number of humans on the same side of the river, or the monkeys will attack the humans. How can all six get across the river without anyone getting hurt?
Ans: The big monkey rows a small monkey over; the big monkey comes back. The big monkey rows the other small monkey over; the big monkey comes back. Two humans row over; a human and a small monkey come back. (Now two humans, the big monkey, and a small monkey are on the starting side of the river, and the third human and the second small monkey are on the destination side.) human and the big monkey row over; the human and a small monkey come back. Two humans row over; the big monkey rows back. (Now all the monkeys are on the starting side of the river, and all the humans are on the destination side.) The big monkey rows a small monkey over; the big monkey comes back. Then the big monkey rows the other small monkey over.
Monkey - m
BigMonkey - bm
Man - M
1. m , bm cross the river and then bm come back.
2.m, bm cross the river and bm come back.
3. M, M cross the river and M,m come back.
4.M, bm cross the river and M, m come back.
5. M, M cross the river and bm come back.
6. m, bm cross the river bm come back.
7. m, bm cross the river.