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Math and logic riddle thread
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 12:32 pm
ChanieMommy wrote:
Hidden: 

Yes. If Anne is married, since she is looking at George, a married person is looking at an unmarried person.
If Anne is unmarried, since Jack is looking at her, a married person is looking at an unmarried person.

So whether Anne is married or not, a married person is looking at an unmarried person...


Yes ma'am
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 12:32 pm
Huey has 3 donuts, Dewey has 5 donuts. Louie comes along and three of them split the donuts equally. In exchange, Louie offers 8 candies to Huey and Dewey. What is the fair way to split the candies?
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 12:34 pm
Tamari wrote:
There are 4 cards in front of you, with the characters B, 6, A and 7 - one on each.
"“If there is a vowel written on one side of a card, then there is an even number written on the other side.”
How many of these four cards do you need to flip in order to check the validity of this statement?


Hidden: 

Two. A and 7
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 12:34 pm
ChanieMommy wrote:
Hidden: 

Two. A and 7

No ma'am
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 12:40 pm
You are on your way to visit your Grandma, who lives at the end of the valley. It’s her birthday, and you want to give her the cakes you’ve made.

Between your house and her house, you have to cross 7 bridges, and as it goes in the land of make-believe, there is a troll under every bridge! Each troll, quite rightly, insists that you pay a troll toll. Before you can cross their bridge, you have to give them half of the cakes you are carrying, but as they are kind trolls, they each give you back a single cake.

How many cakes do you have to leave home with to make sure that you arrive at Grandma’s with exactly 2 cakes?
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 12:46 pm
Tamari wrote:
No ma'am


I think I'm right. Here's why, in my view:

Hidden: 

You need to check A if it has an even number on its back.
And you need to check 7 whether it has NO vowel on its back.

You don't need to check 6, because Vowel -> even does not imply that every even number has to have a vowel on its back...

You don't need to check B, for the same reason...A consonant could have either an odd or an even number on its back...
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 12:50 pm
ChanieMommy wrote:
I think I'm right. Here's why, in my view:

Hidden: 

You need to check A if it has an even number on its back.
And you need to check 7 whether it has NO vowel on its back.

You don't need to check 6, because Vowel -> even does not imply that every even number has to have a vowel on its back...

You don't need to check B, for the same reason...A consonant could have either an odd or an even number on its back...


You're wrong. Here's why:
Hidden: 

You DO have to check B. Did I say every card has a number on one side and a letter on another? There might be a vowel there....
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 12:54 pm
Tamari wrote:
You are on your way to visit your Grandma, who lives at the end of the valley. It’s her birthday, and you want to give her the cakes you’ve made.

Between your house and her house, you have to cross 7 bridges, and as it goes in the land of make-believe, there is a troll under every bridge! Each troll, quite rightly, insists that you pay a troll toll. Before you can cross their bridge, you have to give them half of the cakes you are carrying, but as they are kind trolls, they each give you back a single cake.

How many cakes do you have to leave home with to make sure that you arrive at Grandma’s with exactly 2 cakes?

Hidden: 


2. Poor trolls will stay hungry...

they are too generous for their own good...
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 12:55 pm
ChanieMommy wrote:
Hidden: 


2. Poor trolls will stay hungry...

they are too generous for their own good...


LOL
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 12:55 pm
Oh new stuff? Hurray!
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 12:57 pm
Tamari wrote:
Still on elementary level:

Jack is looking at Anne, but Anne is looking at George. Jack is married, but George is not. Is a married person looking at an unmarried person?

Yes
No
Cannot be determined

Hidden: 

Yes
If Anne is married she’s looking at unmarried
If she’s unmarried, jack is looking at her
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 12:58 pm
Tamari wrote:
You're wrong. Here's why:
Hidden: 

You DO have to check B. Did I say every card has a number on one side and a letter on another? There might be a vowel there....


that's true...
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 1:02 pm
Tamari wrote:
There are 4 cards in front of you, with the characters B, 6, A and 7 - one on each.
"“If there is a vowel written on one side of a card, then there is an even number written on the other side.”
How many of these four cards do you need to flip in order to check the validity of this statement?

Hidden: 

first only 2 come to mind. 6 & A. But then I’m adding the other 2 as well because they can easily falsify the statement
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 1:04 pm
ExtraCredit wrote:
Hidden: 

first only 2 come to mind. 6 & A. But then I’m adding the other 2 as well because they can easily falsify the statement


At least, I did not fall into this trap, but I fell into the other one...
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 1:04 pm
ExtraCredit wrote:
Hidden: 

first only 2 come to mind. 6 & A. But then I’m adding the other 2 as well because they can easily falsify the statement

Explain
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 1:08 pm
Tamari wrote:
Huey has 3 donuts, Dewey has 5 donuts. Louie comes along and three of them split the donuts equally. In exchange, Louie offers 8 candies to Huey and Dewey. What is the fair way to split the candies?
Hidden: 


Dewey gave away 2 1/3 donut while Huey only gave away 1/3
So Dewey certainly deserves 7 candies and Huey only 1. 1 per 1/3.
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 1:11 pm
Tamari wrote:
Explain

Hidden: 

My final answer is that you need to check all to make sure the statement is correct. Because what if 7 had a vowel or 6 has a consonant. A has an odd number or B even. Until you won’t check all you won’t know if it’s true.
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 1:14 pm
ExtraCredit wrote:
Hidden: 

My final answer is that you need to check all to make sure the statement is correct. Because what if 7 had a vowel or 6 has a consonant. A has an odd number or B even. Until you won’t check all you won’t know if it’s true.

Your reasoning is off. Think again.
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 1:16 pm
Need a pen for grandmas cakes
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 1:17 pm
ExtraCredit wrote:
Need a pen for grandmas cakes

Go get one from the messy drawer.
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