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 Mister Logic
Joined: 3/5/2009
Msg: 19
A Simple Puzzle Question...Page 3 of 3    (1, 2, 3)

ONE dog is trained to drive the boat.

Does this mean that ONLY that dog (and nobody else) is allowed to drive the boat?
 Super Ryan
Joined: 9/15/2007
Msg: 20
A Simple Puzzle Question...
Posted: 7/4/2009 11:36:27 AM
Here's a riddle-

5 people and their 5 dogs are trying to cross the river.

Let's name all the men 1,2,3,4,5, the dogs A,B,C,D,E and the ownership is 1A,2B,3C,4D,5E. And we will say they start on the west bank and need to get to the east bank.

Trip:
1. W-E A and B
2. E-W A
3. W-E 1,2 and A
4. E-W 1 and A
5. W-E A and C
6. E-W 2
7. W-E 2 and 3
8. E-W A
9. W-E 1,4 and 5
10. E-W 1
11. W-E 1 and A
12. E-W A
13. W-E A, D and E

What's my prize?
 Super Ryan
Joined: 9/15/2007
Msg: 21
A Simple Puzzle Question...
Posted: 7/4/2009 5:52:15 PM
plus on move 5, you left dogs a AND c without their owners

In move 5, dogs A and C are in the boat without people.

but when they get to the other side, they are alone with person 2

When they arrive, person 2 hops in the boat and leaves.
 Super Ryan
Joined: 9/15/2007
Msg: 22
A Simple Puzzle Question...
Posted: 7/4/2009 7:40:38 PM
Ok, I was under the impression that the dogs would not attack when loading and unloading the boat.
So I have another answer.
________________________________________________________

Let's name all the men 1,2,3,4,5, the dogs A,B,C,D,E and the ownership is 1A,2B,3C,4D,5E. And we will say they start on the west bank and need to get to the east bank.

Trip:
1. W-E ABC
2. E-W A
3. W-ADE
4. E-W A
5. W-E 234
6. E-W 4D
7. W-E 1A
8. E-W 3C
9. W-E 345
10. E-W A
11. W-E ACD
12. E-W A
13. W-E AE

Still 13 trips.
 Mister Logic
Joined: 3/5/2009
Msg: 23
A Simple Puzzle Question...
Posted: 7/5/2009 11:39:56 AM
A QUESTION ABOUT THE RULES: Suppose a dog is in the boat, and a man waiting on the shore is not that dog's owner. When the boat arrives, will the dog attack the man? Or are they allowed to "swap places" quickly enough so that the man can drive safely away?
 Mister Logic
Joined: 3/5/2009
Msg: 24
A Simple Puzzle Question...
Posted: 7/5/2009 11:05:54 PM
A QUESTION ABOUT THE RULES: Suppose a dog is in the boat, and a man waiting on the shore is not that dog's owner. When the boat arrives, will the dog attack the man? Or are they allowed to "swap places" quickly enough so that the man can drive safely away?
yes, the dog will attack man if owner not there

If "swapping places quickly" is not allowed, then I can't solve the puzzle with fewer than 13 trips.
(If "swapping places quickly" WERE allowed, then I could have solved the puzzle with 11 trips.)
 Rainsands
Joined: 1/9/2007
Msg: 25
A Simple Puzzle Question...
Posted: 7/6/2009 2:35:31 PM
Let's name all the men A, B, C, D and E, the dogs a, b, c, d and e and the ownership is Aa, Bb, Cc, Dd and Ee. Dog a is the dog able to drive the boat. NS is near shore and FS is far shore.

1. From the starting shore dogs a, b and c cross. ( NS - A, B. C. Dd, Ee ....FS - a, b, c )
2. Dog a returns. ( NS - Aa, B, C, Dd, Ee ...FS - b, c )
3. Dog a takes dog d to the far shore. ( NS - A, B, C. D. Ee ......FS - a, b, c, d )
4. Dog a returns alone. ( NS - Aa, B, C, D, Ee ....FS - b, c, d )
5. Men B, C and D cross the river. ( NS - Aa, Ee ................FS - Bb, Cc, Dd )
6. Man B and dog b return to the starting shore ( NS - Aa. Bb. Ee ..........FS - Cc, Dd )
7. Man A drives dog a across the river. ( NS - Bb, Ee.................FS - Aa, Cc, Dd )
8. Man D and dog d return. ( NS - Bb, Dd, Ee...........FS - Aa,Cc )
9. Men B, D and E cross the river. ( NS - b, d, e.................FS - Aa, B, Cc, D, E )
10. Dogs a returns ( NS - a, b, d, e.............FS - A, B, Cc, D, E )
11. Dogs a, b and d cross the river. ( NS - e.......................FS - Aa, Bb, Cc, Dd, E )
12. Man E returns ( NS - Ee....................FS - Aa, Bb, Cc, Dd )
13, Man E and his faithful mutt e cross the river ( NS - Clear....FS - Aa, Bb, Cc, Dd, Ee )

Well, I too get 13 steps. There may be a duplication in there somewhere but no dog is left with a master other than his own.
 Mister Logic
Joined: 3/5/2009
Msg: 26
A Simple Puzzle Question...
Posted: 7/7/2009 4:28:10 PM
^^^ I actually did it first. (See post #50)

I didn't post my 13 steps because I thought we were required to solve the puzzle in less than 13 steps.
 Mister Logic
Joined: 3/5/2009
Msg: 27
A Simple Puzzle Question...
Posted: 7/7/2009 4:43:42 PM
I'm not so much interested in the prize as I am in seeing how the OP solved the puzzle in fewer than 13 steps!
 Super Ryan
Joined: 9/15/2007
Msg: 28
A Simple Puzzle Question...
Posted: 7/7/2009 10:30:11 PM
1 in 3 chance.

Since they are fraternal and not identical.

Possible scenarios:
Pup A F, Pup B M
Pup A M, Pup B F
Pup A M, Pup B M

Only the third option would have the other dog male.
 Rainsands
Joined: 1/9/2007
Msg: 29
A Simple Puzzle Question...
Posted: 7/7/2009 10:48:27 PM
Congratulations Super Ryan !!!

Umm, is there any chance I could get a consolation prize ?
 Mister Logic
Joined: 3/5/2009
Msg: 30
A Simple Puzzle Question...
Posted: 7/8/2009 11:10:53 AM
Ah yes... the famous Monte Hall puzzle. (I know the answer, so I'll keep silent. )
 Super Ryan
Joined: 9/15/2007
Msg: 31
A Simple Puzzle Question...
Posted: 7/8/2009 1:30:18 PM
I'm going to leave the Monte Hall alone as well.
Instead here's one I wrote myself. No tricks, just knowing how to slove a problem.



A man goes to a car dealership to buy a truck.
When he gets there, the sales man tells him “today you are in luck; we have exactly one, of every possible combination our truck comes in”.
He then goes over all the options:
7 colours (black, white, red, blue, green, yellow and orange)
V-6 or V-8
Regular Cab, Extended Cab, or Crew Cab
CD or Cassette
Cloth or Leather Interior
Short Box or Long Box (long box not available on crew cab)
2 wheel drive or 4x4 (4x4 only available on the V-8 models)
The base price for the truck is $30,000; it’s an additional $5,000 for 4x4, $1,500 for a long box, $2,000 for leather, $500 for a CD player, $1,500 for an extended cab, $2,500 for a crew cab, $8,000 for a V-8, and the only colour that cost extra is orange for $900.
There is also one special edition truck that is an orange V-8 regular cab 4x4, with a CD, leather and a short box painted to look like the General Lee, it sells for $80,000.

How many trucks are on the lot, and how much would it cost to buy them all?
 Mister Logic
Joined: 3/5/2009
Msg: 32
A Simple Puzzle Question...
Posted: 7/9/2009 1:53:56 PM
In another thread, I have issued a somewhat different kind of puzzle question... one that doesn't involve any kind of mathematical calculations. Can you figure out the answer to that question? (The question is given in Post #28 in the thread, "What if you were a king with absolute power?")

You may post your response in either this thread or that one.

Show ALL Forums  > Science/philosophy  > A Simple Puzzle Question...