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Humans and Monkeys


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37 replies to this topic

#1 rookie1ja

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Posted 31 March 2007 - 11:13 AM

Humans and Monkeys - Back to the River Crossing Puzzles
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!)
* The boat only has room for 2 (monkeys or humans).
* Monkeys can jump out of the boat when it's banked.

This old topic is locked since it was answered many times. You can check solution in the Spoiler below.
Pls visit New Puzzles section to see always fresh brain teasers.


Spoiler for Solution

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#2 mr_pitcher_44

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Posted 04 May 2007 - 04:09 PM

HUH!?!?
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#3 mr_pitcher_44

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Posted 04 May 2007 - 04:09 PM

HUH!?!? in english please!
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#4 rookie1ja

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Posted 04 May 2007 - 05:03 PM

HUH!?!? in english please!


. is an empty bank (or an empty boat in the first and the last step)
H is a human
M is a big monkey
m is a small monkey
> is going right
< is going left
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#5 onyx_sisco

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Posted 26 May 2007 - 05:37 AM

ok, nevermind, I didn't understand the monkeys jump out when it banks at first....
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#6 dak1530

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Posted 27 June 2007 - 04:59 AM

ADMIN this is yours 15 steps (and this is mine 12 steps)

The three columns represent the left bank,
the boat, and the right bank respectively.
The < or > indicates the direction of motion of the boat.
HHHMmm . . (HHHMmm . .)
HHHm Mm> . (HHHm Mm> .)
HHHm HHH Mm> m (HHH Mm> m)
HHH HM HH> mm (HM HH> mm)
HM Hm HM> Hm ---------
Hm Hm)
mm HH> HM (Mm mm HHm)
m Mm> HHH (M m HHHMmm)
. Mm> HHHm
. . HHHMmm
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#7 imtcb

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Posted 02 July 2007 - 10:28 PM

ADMIN this is yours 15 steps (and this is mine 12 steps)

The three columns represent the left bank,
the boat, and the right bank respectively.
The < or > indicates the direction of motion of the boat.
HHHMmm . . (HHHMmm . .)
HHHm Mm> . (HHHm Mm> .)
HHHm HHH Mm> m (HHH Mm> m)
HHH HM HH> mm (HM HH> mm)
HM Hm HM> Hm ---------
Hm Hm)
mm HH> HM (Mm <- This step would result in an eaten human when he arrived at the other side! 1 human, 2 monkeys.
mm HHm)
m Mm> HHH (M m HHHMmm)
. Mm> HHHm
. . HHHMmm


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#8 kingmadmushroom

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Posted 16 July 2007 - 08:04 AM

if the number of humans is zero on one side but there are multiple monkeys does it matter? (after all, the humans cannot be eaten if they are not there)
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#9 Ankur

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Posted 16 July 2007 - 01:50 PM

how about this:-

HHHMmm...
HHMm >Hm...
HHMm...Hm
HM >Hm...Hm
HM...HHmm
>HM...HHmm
...HHHMmm

sounds rite ??? :rolleyes:
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#10 coolkid101

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Posted 19 July 2007 - 06:11 PM

HHH, Mmm
HH mm HM> ........
HH mm <M H
HH m Mm> H
HH m <H Mm
HH Hm> Mm
HH <H Mmm
H HH> Mmm
H <M HH mm
........ HM> HHH Mmm
........ ...... HHH Mmm

Isn't this right :huh:
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