Japanese IQ Test

This is a test that Japanese use for hiring employees in the IT sector.

There are 8 people in one river bank in total: A prisoner, a policeman, a father, a mother, 2 daughters, and 2 sons. Your objective is to move all the people to the other side of the river.


Follow these rules:

1. Maximum of two people can go on the float.

2. Father cannot be with any of his daughters without the mother being present.

3. Mother cannot be with any of her sons without the father being present.

4. The prisoner cannot be left unguarded by the police with any member of the family.

5. Only the policeman and parents can drive the float.


An average person should complete it in about 15 minutes
Can you get them all to the other side? It is possible.


Here is the notation for each of individuals:

  1. Po = Policeman

  2. Pr = Prisoner

  3. F = Father

  4. M = Mother

  5. S1 = Son no.1

  6. S2 = Son no.2

  7. D1 = Daughter no.1

  8. D2 = Daughter no.2

  9. >>> = row the boat to the other side

  10. <<< = row the boat back to the first side


So, if you want to jot down the first step, it should look like this:

  1. Po+Pr>>> (which means that the Policeman takes the Prisoner with him)

  2. Po<< (and this means that the Policeman goes back alone)

  3. and so on…


Solution:

(pstt… No peeking! Finish the test first. ^_^ )


Here are the steps:


  1. Po+Pr >>>

  2. Po<<<

  3. Po+D1>>>

  4. Po+Pr<<<

  5. M+D2>>>

  6. M<<<

  7. M+F>>>

  8. F<<<

  9. F+S1>>>

  10. F+M<<<

  11. F+S2>>>

  12. F<<<

  13. F+M>>>

  14. F<<<

  15. Po+Pr>>>

  16. M<<<

  17. F+M>>>

nirenjoshi  – (27 November 2007 at 17:47)  

Step # 11 of your 17 steps is not allowed - as that will leave F with Ds while the M is on the other side!

EFdez  – (6 May 2008 at 18:53)  

This solution works
Solucion
1. Policia +Prisonero >>>
2. Policia <<<
3. Policia + Hija 1 >>>
4. Policia + Prisonera <<<
5. Madre + Hija 2 >>>
6. Madre <<<
7. Policia + Prisionero >>>
8. Madre <<<
9. Padre + Madre >>>
10. Padre <<<
11. Padre + Hijo 1 >>>
12. Policia + Prisionero <<<
13. Policia + Hijo 2 >>>
14. Policia <<<
15. Policia + Prisionero >>>

JB  – (30 September 2008 at 10:40)  

Solution 2 is even worse. You have the mother coming back on the raft when she is on the wrong side of the river.

Dan Diego  – (20 November 2008 at 20:24)  

1. Po+Pr >>>
2. Po<<<
3. Po+D1>>>
4. Po+Pr<<<
5 M+D2>>>
6. M<<<
7. M+F>>>
8. F<<<
9. Po+Pr>>>
10. M<<<
11. F+M>>>
12. F<<<
13. F+S1>>>
14. Po+Pr<<<
15. Po+S2>>>
16. Po<<<
17. Po+Pr>>>

WINNER!!!

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