Question

QC Challenge Warm-Up #1
Which Child Is Telling The Truth? Please avoid just posting an answer. Explain with sufficient reasoning.

Answer 1

The blonde is the truth teller because he uses `or` while the other uses `and`.

Answer 2

Blondie iz my guess he has better grammar o-o

Answer 3

Your response needs more sufficient reasoning. @Elsa213

Answer 4

The blonde is taller than the other. He/she mentions both choices in the response. Could be either younger or the truth-teller.

Answer 5

The person that gets this right (correct reasoning and all ) will receive a medal from me. I will not be revealing the correct answer to this question until the appropriate time.

Answer 6

Only the correct response PLUS correct reasoning will count as a correct answer. Simple responses i.e. saying 'the answer is A" or circling, or any other such simple responses will not be considered correct.

Answer 7

Okay the Blonde person is telling the truth. Because at a young age typically parents wouldn't tell their children what lying is until later. And younger children generally have this thing I like to call "Tattle telling mode" So thats my reasoning

Answer 8

Are there hints? e.e

Answer 9

@Razor not good enough reasoning.

Answer 10

:T Not gewd enough yew say....hmmm

Answer 11

The information in the post is hint enough @Elsa213

Answer 12

ok then, the second child is telling the truth because she is making it a statement rather than asking a question as the blonde child does with the word , "or"

Answer 13

Put it this way, if this was the actual challenge, none of you would be winners.

Answer 14

Dangit

Answer 15

At least for the answers posted thus far.

Answer 16

Honestly, the information about whos telling the truth and whos lying is split. Considering the fact that younger people can get away with more things and are good liars at times. But also because they normally wouldn't do anything all that bad to begin with UNLESS their copying off of a person. So I might change my answer for this one and I don't think its the older person either their either both lying. OR they are both telling the truth and the culprit is somewhere else

Answer 17

oh, well thats tuff

Answer 18

And the older people, when they grow up they are either good at lying or bad at it. And at an age like they are I would think the dark-haired dude is inbetween

Answer 19

I'm going to give you guys another hour to figure out what the correct reasoning is. If no one posts it, then I will post it. ONE hour. Clock starts right now.

Answer 20

What if the question is lying....? o;

Answer 21

^^^^^^^^^^

Answer 22

@Elsa213 SMH. I don't know how you think of such things.

Answer 23

(Guessing now) Maybe it's the dark haired kid. No one talks like "I am OR I am not" <<< First hint. Secondly, older people have trhe most responsibility. WHICH MEANS He/she would probably take that into consideration....and then use it in his/her own favor?

Answer 24

I'm guessing I'm right, but in Hero's mind I'm wrong.

Answer 25

We are all wrong in his mind

Answer 26

Keep in mind, this is considered to be one of the simplest of all possible puzzles. This is like baseline zero.

Answer 27

e,e Yew make easy riddles hard

Answer 28

There are much higher and more difficult challenges than this.

Answer 29

My mind isn't simple, boi

Answer 30

I know my answer is right I just don't have the reasoning atm

Answer 31

Maybe the way they dress?...

Answer 32

Focus on the statements, nothing else matters.

Answer 33

=~= If that was that case we'd be right 20+ minutes ago

Answer 34

It's that dark-haired kid then, number one, his sentence has a calmer tone both ways if you read it aggressively or not. and Two... He clearly knows how to talk and his speech patterns are ok.. If this isn't right I quit o-o

Answer 35

smh

Answer 36

My view on this is, the purple one has the reason.

I am merely going by wording here but `or` goes by the reason that one must be true.
Like Elsa said, or means that one condition must be true in order to fulfill it.
`and` means both conditions must be true.

Basically since the child in purple used `and` both statements were true, since only one of them is the truth-teller, then the child on the left is only true about the statement that they are younger. ¯\_(ツ)_/¯

irushedthiskbye

Answer 37

.....................

Answer 38

That waz basically what I said but way way smarter

Answer 39

Yes, you definitely rushed this. @Vocaloid feel free to post a solution here if you have one.

Answer 40

I mean

there are only two possibilities:

Left is lying, Right is true

or

Right is lying, Left is true

just assume one of the conditions is true, and follow the all statements to their natural conclusion to see if they hold up

Answer 41

^What she said

Answer 42

Yew guyz are saying that. I'm doing that XD I said "Dark-haired kid- His speech patterns are CLEAR. And like...he looks so calm. He used and correctly. What kinda person says "I am younger or I am the truth teller" << Makes no sense

Answer 43

Your attempt at reasoning reveals whether or not you have approached the problem correctly. This is not just about just choosing a child. The ability to reason properly holds far more weight than simply choosing a child.

Answer 44

The reasoning comes before choosing an answer so if you skip the reasoning part, then you have posted an invalid answer.

Answer 45

Isn't that what we're supposed to do? Or are we supposed to figure out how the other kid is lying aswell..

Answer 46

@563blackghost check your messages

Answer 47

You too @dude

Answer 48

The blonde mentions if he isn't the youngest, he is the truth-teller. Meaning the oldest the the truth-teller.

The pink shirted character mentions she is the oldest so of she's the oldest, she's the truth teller.

So the truth-teller is the pink shirt?

Answer 49

@Elsa213 re-read @Vocaloid's comment. She gives the greatest hint related to this question.

Answer 50

I cri

Answer 51

.......holy..fudge...

Answer 52

-facepalm- we are all very dumb if we didn't notice this lol

Answer 53

Its been an Hour Hero ^-^

Answer 54

I'll call the blonde kid (A) and the brunette (B).

If (A) is claiming that he is younger OR a truth-teller, that would mean, if he IS younger, he is not a truth-teller and if he IS NOT younger, he is a truth-teller (meaning he is older AND a truth-teller) - Assuming he is being honest, this would indicate that (B) is younger and lying. -

(B) is claiming that she is older and a truth-teller. - Assuming that she is being honest, this would indicate that (A) is younger and NOT a truth-teller, which can be validated by his own statement.

(B) is telling the truth.

Answer 55

No, I see the loophole. If (A) is consistently lying, then his statement shouldn't be validated.

Answer 56

...How and why would we be able to come up with reasoning like that?

Answer 57

I feel like I just said that. Lol But maybe I overthought the last bit. If (A) is lying, how were we able to use his own statement to validate? @Hero

Answer 58

There is more than one correct solution to this that does not require the use of truth tables. You don't need truth tables to provide the proper reasoning. I only included the truth tables an an aid. You can perfectly reason to the correct solution using deductive reasoning.

Answer 59

And just in case you're wondering, A second grader is capable of solving this if they are familiar with deductive reasoning so I guess the moral of the story is to review deductive reasoning and logic which you usually learn when you take Geometry.

Answer 60

......

Answer 61

\(\color{#0cbb34}{\text{Originally Posted by}}\) @Hero
@AP correctly solved the riddle. Congratulations.
\(\color{#0cbb34}{\text{End of Quote}}\)

Thank you. (:

Answer 62

I understand. The point that is not clear to me is: If we were able to confirm that (B) is the truth teller based on BOTH claims, doesn't that suggest that (A) contains some validity? @Hero

Answer 63

I feel like you misunderstood my question lol
Okay. We've confirmed that B is the truth-teller... meaning she IS older and IS a truth-teller. Now looking back at A, the claim being "I am younger OR I am a truth-teller". We were technically able to prove that he was being honest as well... because he basically said: "if I am not younger, that means I am lying".... which is also true.

Answer 64

Nevermind. I just phrashed it so badly.

Answer 65

I meant to say: "if I am older, that means I am lying" for A's claim. That IS claim A and does not contradict claim B, and therefore not a lie
I feel like this is a loophole of sorts. I justed wated to be sure that claim A is 100% false.

Answer 66

Maybe I am overthinking it lol stop me if Im being repetitive or making no sense.

Answer 67

Did the statements I used for claim A contradict the original claim, though? I don't see that they did.
I will definitely look into converse, inverse, and contrapositive statements more thoroughly.
Simply, I see that we were able to prove that the claim "I am younger" (A) as true in the process of confirming that (B) is true. Do you see that?

Answer 68

I'm not questioning the process. I'm questioning the structure of this challenge, with all due respect, of course. Earlier you said "This is a learning experience." and I'm definitely going to take all you have said up until now into consideration.
Maybe I was insufficient in elaborating what I meant by 'there is validity in claim (A)', but alas, I tried and I am learning. Hopfully the right way lol

Answer 69

Thank you, @Hero

Answer 70

Ooh, you should do more of these Hero. I never saw somethin like this before. x'D

Answer 71

The correct solution still has yet to be posted.

Answer 72

I thought you said @AP solved this riddle correctly?

Answer 73

I rescinded that statement.

Answer 74

If she was incorrect then I can only surmise that it's because she overlooked the relevance of what the blonde child said?

Answer 75

Considering the blonde child is a hypothetical truth teller in 2 scenarios that are variable, it's possible that B isn't the truth teller? Unless I am overthinking this.

Answer 76

@Marziman don't confuse yourself

Answer 77

Child A said "Or" hmm.

Answer 78

This isn't a guessing game. You either have the correct solution using the correct reasoning or you do not.

Answer 79

Waiiiiiit

Answer 80

Molly's got it. :o

Answer 81

If I were to lie about being older than one of my siblings and they were to say they were older, we would both be saying we are older than the other, so wouldn't that mean that both of these children are telling the truth?

Answer 82

Nice try @YoursTruly but they are not both telling the truth. One of them is lying and it's not enough to just say who it is. You must come with the correct reasoning.

Answer 83

I think I understand this a bit better, the answer comes in the form of a question not an overthought explanation.

Answer 84

I believe we have to assume that both children here could be liars and if we pose the question to them as individuals "Are you the youngest?" then one would tell the truth and the other would lie.

Answer 85

We have no way of knowing who would tell the truth thus, we would have to ask one of them what the other thinks.

Answer 86

The liar will lie and the truth teller will tell the truth.

Answer 87

We say to child B
"What will child A say when I ask if he's the eldest?"
Child B: "Child A will say I am the youngest" Then we know to choose Child B as the truth teller.

Answer 88

Since the answer from Child A will be redundant.

Answer 89

Not to cut Marzi off or anything but taking into consideration what the blond child said; "I am the younger one or I am the truth-teller" and comparing it to what the other child said; "I am the older one and I am the truth teller" it's as if the blond child is saying that if the other child's statement contradicts his own statement then he is telling the truth but the blond child also uses "or" instead of "and" and that throws me off a little bit considering how it mixes up the statement. "I am younger OR I am the truth-teller." It's like saying I can tell people I'm younger or I can tell the truth, the truth being I'm older. It's really difficult to explain this, but my final answer is B is lying.

Answer 90

I reversed mine on accident.

Answer 91

Mhm LMAO

Answer 92

In essence the answer is a simple question.

Answer 93

No I did, read I made a typo.

Answer 94

Your answer is somewhat incorrect. Again, the answer comes in the form of a question not an explanation.

Answer 95

*Applause* Yaaa! Hopefully one of these is right, because the thread is pretty damn long. x'D

Answer 96

I'm having difficulty articulating the answer but I have it.

Answer 97

Yeah it's child B. Here's the reason why, hopefully I don't make a fool of myself.

Answer 98

So what they're saying are answers to the question I stated had to be asked previously. "What would the liar say?"

Answer 99

Child A: "I am youngest or I am the truth teller"
Child B: "I am the oldest and I am the truth teller"
What we have to do is deduce whom is lying by doing the opposite.

This means Child B would have to be lying as we have to assume the opposite. Child A is saying Child B will say Child A is youngest and Child B is saying Child A will say Child B is oldest. Both of these answers state Child B is oldest and if only of them is telling the truth that means Child A is the truth teller and Child A is the eldest.

Answer 100

@Hero

Answer 101

Let me analyze this

Answer 102

Alright.

Answer 103

Your reasoning starts to get questionable when you start saying stuff like "Child B will say Child A is ..." Not following your reasoning there.

Answer 104

Child A is not saying Child B will say anything.

Answer 105

It appears they're answering a question

Answer 106

"What would the other child say if I asked their age?" That's the only way to obtain the truthful answer.

Answer 107

Child B is saying Child B is the oldest and Child B is the truthteller.

Answer 108

Child B is talking about Child B. Child A is talking about Child A

Answer 109

What Child A says essentially supports that but since one of them is lying we'd have to choose the opposite.

Answer 110

B can't be telling the truth.

Answer 111

If you feel that way, show how he is not. You can say that all day, but without demonstrating it, you're just making a statement that we won't know is true or false. We each can draw our own conclusions about the truth or falsity what is being said.

Answer 112

Alright I finally have the answer I was way overthinking everything it's much more simple than I originally thought.

Answer 113

Child B is the liar. The statements that Child A and Child B make both point to Child B being the eldest, right? Child A says "or i'm the truth teller" whereas Child B says "and I'm the truth teller". The statements confirm each other and since both point to B as being the eldest, minus the variability of "or I'm the truth teller" we have to now include that "or" part. When you include the part where Child A says "or" it means that they must be the eldest, since we don't know who's lying the opposite of the immediate evidence (that which claims B as the eldest) must be false. This means Child A is the truth teller.

Answer 114

Also, allow me to elaborate on the statements. Child B's claim is, seemingly, absolute making it appear that they are most definitely the truth teller. Child A's statement is unclear until you look at the situation past the first layer. When Child A says or it means "I am not the youngest if I am telling the truth" so by saying "or" it makes a claim that "B" must be the eldest which seems plausible as they themselves say it. Though, the simplicity is a smoke screen to throw you off. Child A MUST be telling the truth since if they're the youngest then they're LYING about being the youngest. So if the child tells the truth then they can't be younger, since the statements both point to B as the eldest on the surface level, going in the opposite direction shows the real answer. So, again, Child A is the truth teller and Child B is the liar.

Answer 115

For anyone that's too lazy to read the whole thing here's the short and sweet answer,
B is the liar, A is telling the truth. If A says they're the youngest then they're lying, since A says "or" it means that to tell the truth they must be the eldest. Since both statements support B as the truth teller the correct answer is the one opposite of B.

Answer 116

sorry to add another post to an already-long thread but upon request I'm adding my solution

1. I assumed that B is telling the truth
2. Under this assumption, B is the older one and the truth-teller; A is the younger one and the liar.
3. If A is the liar, then both of his statements must be factually incorrect. (because he used the word "or" rather than "and", as long as he makes at least 1 true statement he's telling the truth.
4. However, since A states "I am the younger one" that is a factually true statement under our current assumptions
5. So this assumption does not logically work out, meaning the other possible assumption (A is the truth teller, B is the liar) is the valid solution

Answer 117

After careful consideration, I have no choice but to declare @Vocaloid the winner of this challenge. She presented her reasoning using a set of logical statements that clearly demonstrate which child is telling the truth. Congratulations.

Answer 118

Wait what?

Answer 119

I said the exact same thing first.

Answer 120

@Hero

Answer 121

Efficiency, Clarity, and Logic and Reasoning were factors in determining the winner.

Answer 122

I explained it in 2 paragraphs and gave a brief TLDR version.

Answer 123

Mine had all of those.

Answer 124

You said explain with sufficient reasoning, I did so 2 hours before vocaloid.

Answer 125

I only elaborated on what are already components of strong reasoning.

Answer 126

I don't understand how that is exactly fair considering I had the answer written and their answer was mine but in a different format.

Answer 127

*Written first

Answer 128

There will be plenty challenges for you to win going forward.

Answer 129

But I won this already under the rules you set, no?

Answer 130

These are just warm-up challenges. The real challenges, you'll be able to win gift cards, etc.

Answer 131

There were no other guidelines outside of sufficient reasoning.

Answer 132

I chose the winner based what I was looking for in terms of reasoning. It's more about recognizing what is expected in terms of a correct answer than any one person. So I wasn't necessarily choosing a winner. I was choosing the answer that most closely represents logical reasoning and efficiency. It simply represents what I am looking for in terms of an acceptable response and gives other users an understanding of what kind of answer is expected.

Answer 133

You didn't provide those guidelines though so under your rules I won your challenge. I answered with all of the same logic Voca provided but 2 hours+ before them.