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Math and logic riddle thread
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 4:01 pm
malki2 wrote:
🥳

I’m off to a nap Hi

Hidden: 

Yea right, in 10 hours from now
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  Tamari  




 
 
    
 

Post Tue, Oct 13 2020, 4:01 pm
ChanieMommy wrote:
What did he lose?

Hidden: 

20$ or rather 5$ and a pair of shoes...

This is the most accurate answer.
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 4:07 pm
I have a hard one. Is anyone up for it?
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  Mrs. XYZ  




 
 
    
 

Post Tue, Oct 13 2020, 4:07 pm
Tamari wrote:
A customer in a shoe store bought a pair of shoes that were on sale for $15.00. He gave the salesman a $20.00 bill. Since he did not have change, the salesman went to an adjoining store and asked the lady in charge to give him change. She obligingly gave him a $10.00 bill and two $5.00 bills. The shoe man then returned and gave the customer his shoes and $5.00 change. The customer left.

After the customer left, the lady who gave the salesman the change came into the store and told him that the $20.00 bill was a counterfeit. He looked at the bill, agreed that it was indeed worthless, and immediately repaid her with a good $20.00 bill.

That night, as he was closing the store, the shoe man began thinking about what he had lost in this series of transactions.

What did he lose?


Hidden: 

A pair of shoes, $20 plus $5


oops, just realized my mistake


Last edited by Mrs. XYZ on Tue, Oct 13 2020, 4:18 pm; edited 1 time in total
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  Tamari  




 
 
    
 

Post Tue, Oct 13 2020, 4:08 pm
malki2 wrote:
Diophantus (father of Algebra) had the following riddle written about his life:

Diophantus’s youth lasted 1/6 of his life. He had his first beard in the next 1/12 of his life. At the end of the following 1/7 of his life, he got married. Five years from then his son was born. His son lived exactly 1/2 of Diophantus’s life. Diophantus died 4 years after the death of his son. How long did Diophantus live?

Hidden: 

84. It's actually the only multiple of 6,12 and 7 that a person can possible live for.....
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  Tamari  




 
 
    
 

Post Tue, Oct 13 2020, 4:10 pm
malki2 wrote:
I have a hard one. Is anyone up for it?


First post! Will be up to it when my kids are sleeping....
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 4:11 pm
Tamari wrote:
Hidden: 

84. It's actually the only multiple of 6,12 and 7 that a person can possible live for.....


The multiples didn’t need to be whole numbers though.
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 4:13 pm
Tamari wrote:
First post! Will be up to it when my kids are sleeping....


At 12:00 the hour and minute hand are on the same spot. Exactly when, to the hundredth of a second, will they be together again?
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  Tamari  




 
 
    
 

Post Tue, Oct 13 2020, 4:19 pm
malki2 wrote:
The multiples didn’t need to be whole numbers though.


True, but it's easiest to try with whole numbers, and it worked.
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 13 2020, 4:27 pm
Quote:
Diophantus (father of Algebra) had the following riddle written about his life:

Diophantus’s youth lasted 1/6 of his life. He had his first beard in the next 1/12 of his life. At the end of the following 1/7 of his life, he got married. Five years from then his son was born. His son lived exactly 1/2 of Diophantus’s life. Diophantus died 4 years after the death of his son. How long did Diophantus live?

Hidden: 


84 years.

1/6 age+ 1/12age + 1/7age + 1/2 age + 4 + 5 = age

age - age(14 + 7 + 12 +42)/84 = 9

(9/84)age = 9

age = 84

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  ChanieMommy  




 
 
    
 

Post Tue, Oct 13 2020, 4:30 pm
malki2 wrote:
At 12:00 the hour and minute hand are on the same spot. Exactly when, to the hundredth of a second, will they be together again?


Hidden: 

1:05, but I have no nerves for the (1/100)''
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 4:32 pm
ChanieMommy wrote:
Hidden: 

1:05, but I have no nerves for the (1/100)''


Of course it’s 1:05. That’s quite simple. You don’t need Algebra (or Calculus) for that.
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 4:50 pm
ChanieMommy wrote:
Hidden: 

1:05, but I have no nerves for the (1/100)''


At least get the seconds correct. Forget about the 1/100 for now (although once you get one, you’ll automatically get the other).
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 4:51 pm
ChanieMommy wrote:
Quote:
Diophantus (father of Algebra) had the following riddle written about his life:

Diophantus’s youth lasted 1/6 of his life. He had his first beard in the next 1/12 of his life. At the end of the following 1/7 of his life, he got married. Five years from then his son was born. His son lived exactly 1/2 of Diophantus’s life. Diophantus died 4 years after the death of his son. How long did Diophantus live?

Hidden: 


84 years.

1/6 age+ 1/12age + 1/7age + 1/2 age + 4 + 5 = age

age - age(14 + 7 + 12 +42)/84 = 9

(9/84)age = 9

age = 84



🥳
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 6:02 pm
malki2 wrote:
Of course it’s 1:05. That’s quite simple. You don’t need Algebra (or Calculus) for that.

I don’t chap if this is the answer you’re looking for or something trickier?
Also by the time it’s :05 isn’t the small handle a drop off? Wouldn’t 1:06 or :07 work better?


Last edited by ExtraCredit on Tue, Oct 13 2020, 6:04 pm; edited 1 time in total
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  Tamari  




 
 
    
 

Post Tue, Oct 13 2020, 6:03 pm
ExtraCredit wrote:
I don’t chap if this is the answer you’re looking for or something trickier?


What part don't you chap?
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 6:04 pm
ExtraCredit wrote:
I don’t chap if this is the answer you’re looking for or something trickier?


How many seconds into 1:05 is it? (It’s a math problem, not a riddle. No tricks.)


Last edited by malki2 on Tue, Oct 13 2020, 6:09 pm; edited 2 times in total
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 6:05 pm
Tamari wrote:
What part don't you chap?

Whether the answer was given yet or not.
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 6:06 pm
malki2 wrote:
How many seconds into 1:05 is it? (It’s a math problem, not a riddle. No tricks.)

Oh you answered my previous question. It’s 1:05 and change. So you wanna know how much change. Ok let’s see.


Last edited by ExtraCredit on Tue, Oct 13 2020, 6:23 pm; edited 3 times in total
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  Tamari  




 
 
    
 

Post Tue, Oct 13 2020, 6:06 pm
ExtraCredit wrote:
Whether the answer was given yet or not.


Not yet.
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