Can You Solve This Riddle?

[Doubles22]

There are these exactly identical twins. One always tells the truth, the other always tells a lie. Each one is guarding a door- one to hell, the other to heaven. You are allowed to ask each twin one question. What should you ask?? oh yeah, they know which door they are guarding.

You ask one twin which door the other twin will say is the door to heaven.  Whatever answer you get, go to the opposite door.

[ReddGirl]

Ask one of them if they are a twin. If they say, "yes", that's the one that's telling the truth.

Ask the other one if they are guarding the door to Hell:

a. If they say, 'no', it's really, 'yes'.

b. If they, 'yes', it's really, 'no'.

Almost....
Ask both of them if they are a twin. The one that says no is the liar. You then can talk with the one that said yes to give you the correct door.

[Fenix]

Wow, this riddle reminds me of a Samurai Jack episode.

Pretty cool

[sjonathan02]

Almost....
Ask both of them if they are a twin. The one that says no is the liar. You then can talk with the one that said yes to give you the correct door.

Won't you have then cheated by asking the one twin two separate questions? 

[Doubles22]

Won't you have then cheated by asking the one twin two separate questions? 

That's why my way works.  And you only ask one person one question.

[nessalynn77]

A man pushes his car to a hotel and goes bankrupt. Why?

He's playing Monopoly


The maker doesnt want it,
The buyer does not use it,
and..
The user does not see it.
What is it?

[sjonathan02]

You ask one twin which door the other twin will say is the door to heaven.  Whatever answer you get, go to the opposite door.

This way doesn't work because you don't know which twin is lying.

[sjonathan02]

He's playing Monopoly


The maker doesnt want it,
The buyer does not use it,
and..
The user does not see it.
What is it?

A coffin.

[Fenix]

You guys are good!!!

[Doubles22]

This way doesn't work because you don't know which twin is lying.

Yes it does.  Check it out.

Let's say that Twin A is the lying twin guarding the Heaven door.  Twin B is the truth twin guarding the Hell door.  But you don't know this.

Here's the coversation.

Doubles: Say, Twin A, if I go ask your boy over there which one of these doors leads to heaven, which one will he say is the Heaven door?

Twin A (who always lies): He'll tell you that his door is the Heaven door.

So you go to Twin A's door to heaven.  Why?  You didn't ask Twin A which door was right.  You asked him what the other would say.  Since Twin A always lies, he'll lie about what Twin B would say.  His statement of "He'll tell you that his door is the Heaven door." is the lie.

Flip the script.

Doubles: Say Twin B, if I go ask your boy over there which one of these doors leads to Heaven, which one will he say is the Heaven door.

Twin B (who always tells the truth): He'll say that my door is the Heaven door.

Twin B is now truthfully stating that Twin A will lie about which door is the Heaven door.  So you go to Twin A's door to Heaven.

[sjonathan02]

Yes it does.  Check it out.

Let's say that Twin A is the lying twin guarding the Heaven door.  Twin B is the truth twin guarding the Hell door.  But you don't know this.

Here's the coversation.

Doubles: Say, Twin A, if I go ask your boy over there which one of these doors leads to heaven, which one will he say is the Heaven door?

Twin A (who always lies): He'll tell you that his door is the Heaven door.

So you go to Twin A's door to heaven.  Why?  You didn't ask Twin A which door was right.  You asked him what the other would say.  Since Twin A always lies, he'll lie about what Twin B would say.  His statement of "He'll tell you that his door is the Heaven door." is the lie.

Flip the script.

Doubles: Say Twin B, if I go ask your boy over there which one of these doors leads to Heaven, which one will he say is the Heaven door.

Twin B (who always tells the truth): He'll say that my door is the Heaven door.

Twin B is now truthfully stating that Twin A will lie about which door is the Heaven door.  So you go to Twin A's door to Heaven.

You're assuming that you know which door each twin is guarding AND which twin is lying. Switch doors and use your scenario and see what happens.

[ReddGirl]

Ask one of them if they are a twin. If they say, "yes", that's the one that's telling the truth.

Ask the other one if they are guarding the door to Hell:

a. If they say, 'no', it's really, 'yes'.

b. If they, 'yes', it's really, 'no'.

The key of the riddle is to establish which one you can trust to give you the right door.

The riddle says you can ask each twin a question. It doesn't matter if it is the same question. My understanding was there is one thing you KNOW for certain. They are twins and that ONE always lies and ONE always tells the truth.

[Fenix]

fight, fight...

[sjonathan02]

The key of the riddle is to establish which one you can trust to give you the right door.

The riddle says you can ask each twin a question. It doesn't matter if it is the same question. My understanding was there is one thing you KNOW for certain. They are twins and that ONE always lies and ONE always tells the truth.

Actually, that's TWO things:

a. I know they're twins
b. I know that one lies and one tells the truth.


That's why my asking one of them if they are twins works. It forces the truth or lie from one of them, then you ask the other one about the doors.

[sjonathan02]

fight, fight...

SILLY, SILLY dude!!!! 

[ReddGirl]

Doubles22 has a good argument.

[sjonathan02]

Doubles22 has a good argument.

Nope. His scenario assumes more than your riddle allows.

[ReddGirl]

I surrender Doubles and Sjon....logic makes room for various scenarios as long as the end result is achieved.

[Doubles22]

You're assuming that you know which door each twin is guarding. Switch doors and use your scenario and see what happens.

Too easy.  Watch this.


Let's say that Twin A is the lying twin guarding the Hell door.  Twin B is the truth twin guarding the Heaven door.  We'll assume we don't know who's the liar or what door they are guarding. 

Here's the coversation.

Doubles: "Say, Twin A, if I go ask your boy over there which one of these doors leads to heaven, which one will he say is the Heaven door?"

Twin A (who always lies): "He'll tell you that my door is the Heaven door. (This statement is a lie because the truth-telling Twin B wouldn't say this.)

So you go to Twin B's door to heaven.  Why?  You didn't ask Twin A which door was right.  You asked him what the other would say.  Since Twin A always lies, he'll lie about what Twin B would say.  His statement of "He'll tell you that my door is the Heaven door." is the lie.

Flip the script.

Doubles: Say Twin B, if I go ask your boy over there which one of these doors leads to Heaven, which one will he say is the Heaven door.

Twin B (who always tells the truth): "He'll lie to you and say that his door is the Heaven door." (Twin B is telling the truth about what Twin A would say...and we all know Twin A is going to lie.)

Twin B is now truthfully stating that Twin A will lie about which door is the Heaven door.  So you go to Twin B's door to Heaven.

[sjonathan02]

Too easy.  Watch this.


Let's say that Twin A is the lying twin guarding the Hell door.  Twin B is the truth twin guarding the Heaven door.  We'll assume we don't know who's the liar or what door they are guarding. 

Here's the coversation.

Doubles: "Say, Twin A, if I go ask your boy over there which one of these doors leads to heaven, which one will he say is the Heaven door?"

Twin A (who always lies): "He'll tell you that my door is the Heaven door. (This statement is a lie because the truth-telling Twin B wouldn't say this.)

So you go to Twin B's door to heaven.  Why?  You didn't ask Twin A which door was right.  You asked him what the other would say.  Since Twin A always lies, he'll lie about what Twin B would say.  His statement of "He'll tell you that my door is the Heaven door." is the lie.

Flip the script.

Doubles: Say Twin B, if I go ask your boy over there which one of these doors leads to Heaven, which one will he say is the Heaven door.

Twin B (who always tells the truth): He'll say that his door is the Heaven door. (Twin B is telling the truth about what Twin A would say...and we all know Twin A is going to lie.)

Twin B is now truthfully stating that Twin A will lie about which door is the Heaven door.  So you go to Twin B's door to Heaven.

Since, it's just me and you in this: You HAVE to get rid of the first sentence. Until you do that, we'll keep going round and round.

You ONLY know:

a. They're twins
b. One lies and one tells the truth.
c. Each twin knows which door they're guarding.

THAT'S. IT.


Anything else, and one is trying to make their argument based on something that's NOT in the original scenario.

That's all I'm saying.